In my experience the best way to find out is to spin up your own instance and play around with it! Docker makes this super easy because you can throw it away after without making any changes to your server. Searxng works pretty easily in a docker container
Hmmm... Making social media companies liable for what users post. I'm all for making them take a more active involvement in what's going on but that would open up anyone hosting stuff to a world of liability...
In my experience the best way to find out is to spin up your own instance and play around with it! Docker makes this super easy because you can throw it away after without making any changes to your server. Searxng works pretty easily in a docker container