What I didn't understand is:
1- who is hosting the instance?
2- does my I stance store data from other I stances? If yes, what data exactly and why?
3- let's say I've banned a user, that user can just view my instance from another instance as if nothing happened?
4- when a user exists on more than one instance at the same time using the same account. How can I moderate them? And who stored their data?