Of course, why not?

Yeah, but you can only get banned from an inatance. You can always migrate to another instance (another url hosting lemmy)

Yes. I was recently banned off lemmy.ml… and it took me asking dumb technical questions all over Lemmy to discover that no, it wasn’t just a login problem and that you don’t actually get notified of any bans - you have to go look it up in the modlog.