Imagine not being able to send an email to your friend because the administrator of the server where they happen to have an account and the admin of your email server have a personal tiff and block emails from each respective servers. None of this has anything to do with you and your friend except for the fact that you can not communicate. Seem familiar? It should because this happens all the time on the #Fediverse. Federation is not a good moderation tool and it's misuse hurts the #Fediverse community as a whole.