If I am understanding your question correctly: It means I am not on lemmy.world, I’m on sh.itjust.works, which is federated with lemmy.world but our users are not hosted on your website. I am reading this and posting from a different website.
So you can post to other instances of lemmy like sopuli.xyz or startrek.website as well as your own home instances, as long as they are federated (connected). If you find you don’t like how one instances is being run, you can always stop using it and register with a different instance (website) while still being able to post to various Lemmy instances.
Aah, sorry, so jury nullification is a legal concept that basically says if a jury thinks someone should not be punished for a crime, even if they are guilty beyond a reasonable doubt as proven by the evidence presented, they are still technically allowed to rule not guilty. This might be because they think the law itself is unjust, the circumstances of the crime still warrant a not guilty verdict, or some other reason entirely.
Not surprisingly, it’s a controversial subject, but it is an established legal concept in the United States and, even if certain people try to quash discussion of it or spread awareness of it, it is 100% lawful. In my opinion, censoring legal discussions in this way is a step too far and claims of liability are very overblown.