Excellent advice, everyone!
Wow, let's just say, "The fediverse isn't typical social media" -- and yes, Jim, there IS intelligent life in the universe.
As for what's getting ripped off: photos, posts, graphics, articles, entire freaking books (wait for Elena's post), audio files, our identities... you name it; it's showing up (usually on sites with not-so-great English).
If you haven't started already, keep a dossier on all the sites you grant interviews too, etc, and a copy of the written agreements made with them about what they use and how. That might become important in a legal situation that needs to backtrack links on claimed infringed content and where it came from.
Likewise, keep a record on all the sites that you did not give rights to, and bring the hammer down on them before it gets further out of control.