As long you're using more than one relay, you're immutable to most relay censorship. Unlike your Mastodon account, which resides on a single server. It would take some sort of mass consensus from all relay operators to ban a pubkey, which I doubt would ever happen. There will always be an available relay where it's operator doesn't give af about the content that passes through it.
Have you heard of #FediBlock
It has happened and will happen here
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Yes, am aware. I also operate a Mastodon server.