I think it’s great that someone is loudly and publicly saying no to them.
Just because the UK is modelling themselves in the same image doesn’t mean that the tactic for dealing with extrajudicial censorship attempts is different.
That's not what I'm saying just harms his clients though. There's obvious (almost entirely domestic, probably counter productive as to UK politics) lobbying value in that. It's the part where he sends confessions back to the UK regulators privately that just harms his clients.
Without that, he’s just a guy with a blog, and can’t effect any real change. Whether it harms or benefits his clients or not is likely a question of politics. If these responses drum up enough attention that his GRANITE act gets passed, that’s arguably a better outcome for each client jointly and severally than just ignoring the letters.