[dada78641]

I think this is the correct way of doing it. Anyone can start their own instance and their own federation.

It'd actually be a massive breach of freedom if you were somehow not allowed to shut out servers from your Mastodon federation—kind of like not having the freedom to block someone on Twitter.

[kstrauser]

Exactly. Anyone has the freedom to post whatever they want on their own server. I have the freedom not to carry their traffic.