Lemmy blocked his users like that.
Reddit saved her users.
https://torrentfreak.com/reddit-defeats-filmmakers-second-attempt-at-unmasking-anonymous-users-230731/
Lemmy devs said "Just an instance did. Lemmy is not evil!" as it were someone else's issue, and blamed Reddit somehow.
Users seemed to be able to do full text search only in their own account's posts.