I really enjoyed Watch_Dogs, despite the shit it got at the time.

Not exactly like the ones you oncluded, but I really like this one: Challenger - Lemmino

If you want to get rid of spam bots, ban them on your own instance and defederate any instance that doesn’t do the same.

But if you mean whether these posts are also deleted for people viewing your instance through another, federated instance, then yes, that is the case.

no, think about what that would imply. Anyone could practicaly delete any other profile by creating an instance and banning that profile on that instance. That would be insane.