I keep seeing people ask for this. There are basically only two ways, neither of which are terribly easy unless you are willing to switch to a Lemmy alternative and then it can be a breeze with just a couple of button clicks.
First, note that on base Lemmy, it basically cannot be done, short of either spinning up your own instance or trying to do some advanced programming with spamblock filtering rules (that is likely to mess up the pages in some way). There is a related feature though - in User -> Settings -> Blocks -> scroll waaay down -> Block instance - except that unlike blocking a community or a user, this does not actually "block an instance", and instead merely (& misleadingly?) hides the communities on those instances. You will still see comments from those users, they can still downvote you, and ping your notifications, etc.
About the only thing the above approach offers beyond blocking those communities individually is that if ever new communities were to be made from those instances, they would be automatically hidden from your account. So not all that helpful imho.
(1) Use an App
I have heard that the Sync and Connect apps (+ maybe others?) offer this, as well as a plethora of other features. Note that Voyager does not work for this - it is the same type of blocking as mentioned above.
Check them out? If anyone wants to supplement this section, please submit a post to this community to help people who want to know! (and/or at least add it in the comments here)
(2) Lemmy Alternatives
What I do use is PieFed.social, which in addition to this feature also offers several other advancements not currently available in Lemmy such as Categories of Communities that makes finding additional content a breeze (though overall it is not as feature-rich or easy to use as base Lemmy; and yet its choice to use Python rather than Rust should help it to catch up extremely quickly, plus the admins are extraordinarily responsive to deal with any issues).
To block all users from a PieFed instance, the easiest way is to start from a user on that instance, click their account, then click More -> Block everyone from [instance_name]. Or you could go to a page with the instance name in the url, like https://piefed.social/instance/lemmy.ml and just click "Block everyone from [instance_name]" there.
PieFed also offers additional opportunities in-between blocking trolls vs. not doing so: accounts that meet certain criteria levels will have icons placed next to the account name, so that you can still see their content (rather than have it automatically removed) but not have to spend as much time parsing it as you would something that is more likely to have been offered in good faith.
Mbin likewise offers Categories, and cross-connection with Mastodon. Overall I find that whole style confusing - e.g. "communities" become "magazines", downvotes become "reduces", upvotes are both "favorites" and also upvotes exist too that are entirely separate from that, plus you can see who offers favorites, but only from other Mbin/Kbin users and you cannot see the same for reduces. ~~Though if you want Mastodon integration with Lemmy in one account, this is definitely the way to go (b/c it's the only one that does both:-)~~. From @nictophilia@fedia.io:
It's not anywhere in the settings at all, lol. Like a hidden option. You have to go to the url
https://fedia.io/d/[instance_domain_name]
, like https://fedia.io/d/lemmy.ml. Then it will give you the ability to block, and that block will be reflected in your settings page.
Edit: according to @DarkThoughts@fedia.io, this does not actually work:-(.
Either of these alternatives should make you quite happy with the result!:-)
(3) Honorable mention: relying upon an instance admin
As a normal user, not an admin yourself, you cannot implement a custom block of users from any specified instance. However, you can either ask your current admins to implement such a block for you (would need the support of the entire community on that instance ofc), or move your account to one that has already done so?
The only instances I've ever heard of that block the big-3 (lemmygrad.ml, hexbear.net, and lemmy.ml) are:
- lemmy.cafe - has very welcoming messages, including a link guiding new users to this community!:-)
- Tesseract on dubvee.org - extremely impressive, if not for everyone, but definitely worth a look
- quokk.au
The caveat to all of these is that each is a single-admin instance. Those of us who recall the story of e.g. Kbin.social (or dmv.social or so many others) know how worrisome that can be in that it could vanish overnight with little to no warning. Then again, unlike Kbin.social, they seem quite healthy for now - definitely worth at least taking a look?
A lot of people seem taken aback because the local feed is full of crypto stuff. But I imagine this has little to do with the admin and someone just started a crypto community there. Lemmy.cafe being a tiny instance, it then dominates local.
I sorted by New and see what you mean, but I also noted that while the most recent post on the entire instance is from 2 days ago, the second most recent post is 17 days ago. And yes both are crypto, but they are a weekly newsletter, which even in the titles reflects that it skipped a week. Anyway, that instance seems to routinely go days to weeks without posting anything at all. So that's not really the purpose of the instance.
My previous instance Discuss.Online is similar: there are no communities with more than 50 monthly active users. Instances like these are meant more as on-ramps to the wider Fediverse than as destination spots on their own. Others like yours and StarTrek.website are more of a mixture, offering both - although even so, all of the communitied on StarTrek.website combined still only represents a third of the monthly active users compared to the singular !tenforward@lemmy.world community featuring Star Trek memes. Therefore the StarTrek.website instance "has content", but it is likewise tiny, even for content specifically related to Star Trek โจ.
So then I'm not sure: why are people taken aback? The default sort for someone without an account is not Local but rather All, for that reason. Someone would have to specifically switch the default to Local in order to see that? At a guess, it is just mismatched expectations - presuming that in addition to using that instance to access the Fediverse, that it would offer content of its own. Which it does but... barely. I am not sure why that should be a default expectation though?
Still, I hope you don't feel like I'm picking on you, it's definitely a valid point that if people feel taken aback about the instance, for whatever reason, then it is less likely to be used by them.
Well, seems like we are not there yet:
@OpenStars@piefed.social FYI Lemmy.cafe is quite slow for me, and I can't create posts. Might be due to using the 0.19.6-beta version of Lemmy
Wow that modlog indeed is SUPER slow... but then again, others are fairly slow as well? Though to pull up lemmy.cafe's takes ~13 s in one test whereas lemmy.ca's took ~2 s. That indeed may be due to running a beta.
Also that beta version code keeps changing - e.g. I recall earlier (maybe a week ago?) it was BE: 0.19.6-beta.9, while now it is -beta.13. So that update process was not a one-off - I hope he doesn't have an automated update process, that would make the instance quite unstable / experimental?