Only on the client side.

The protocol itself is fine.

People choose for themselves which clients to use.

But, just a hypothetical.

Say app/play store removes all the clients that don't implement the system amethyst has.

Effectively you're hidden from all new users if just a handful of Devs or influencers think you're annoying, offensive, whatever.

It doesn't even have to be intentional on the part of those who mute you.

primal may even have something similar already in place because sometimes replies I see on yakihonne on other people's notes from people I don't follow do not show up when I'm using primal

But it could be a bug or just my poor internet connection I don't want to muddy the waters with accusations.

Incorrect