It's only been two so far, but I'm getting really sick of the follow-bots that have followed me because the instance I'm on defederated from gab based instances.
Think about if just any random instance pulled that crap. Part of federation is that there is not an obligation to federate with instances that you don't wish to federated with. There's also minimal friction to leaving an instance. If I wanted an instance that federated with gab, I would move to an instance that does that!