Lemmy

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Do defederation blocks work indirectly? (feddit.de)

submitted 1 year ago* (last edited 1 year ago) by xlsigned@feddit.de to c/lemmy@lemmy.ml

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Scenario

Instance A blocks Instance T.
Instance B allows Instance T.
Instance B has a Community C to which both Users from A and Users from T subscribe.

Question

Does the local copy of C on A show posts/comments/votes by Users from T?

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[–] nachtigall@feddit.de 0 points 1 year ago (3 children)

No, they do not show up.

[–] xlsigned@feddit.de 0 points 1 year ago* (last edited 1 year ago) (2 children)

Is this behavior documented somewhere? The best source I could find so far is this:

https://codeberg.org/fediverse/fep/src/branch/main/fep/1b12/fep-1b12.md#the-announce-activity

From which I deduce that Activities (posts/comments/votes) go from T to B, are wrapped into an Announcement and then go from B to A where they are unwrapped. And since A does not block B, A needs to check the originating User domain of every Activity found inside in order for the T-block to be enforced indirectly, too.

[–] nachtigall@feddit.de 0 points 1 year ago (1 children)

I don't know. I only know it from experience, as comments from lemmygrad.ml users made on lemmy.ml do not show up on feddit.de.

[–] xlsigned@feddit.de 0 points 1 year ago* (last edited 1 year ago)

I only know it from experience, as comments from lemmygrad.ml users made on lemmy.ml do not show up on feddit.de.

This matches what was said on/about lemmy.world when they were defederated from beehaw.org. https://lemmy.world/post/149743:

Communities on other instances, for example lemmy.ml, are unaffected by this. Lemmy.world and beehaw.org users will still be able to interact with those communities, but posts/comments from lemmy.world users won’t be visible to beehaw.org users, as defederation prevents our posts/comments from being sent to the version of these posts hosted on beehaw.org.

Still, having this documented somewhere would be nice.

Anyway, it would mean that there is not much reason for A to also defederate from B, if T (you probably guessed it) was Threads. Though Users from B could still be quoting Users from T and/or be influenced by Users from T, but the impact from T on A appears to be very minimal in the given scenario.