Yeaaaah, the Communications Act 2003 is not fit for purpose in the modern information age where [seemingly] the vast majority of conversation is taking place in digital spaces. Sidenote, I do think it's amusing how, prior to the Online Safety Act 2023, it was an offence to Cunningham's Law someone (posting a knowingly-false statement online to annoy someone into correcting you). That said, I'm more or less ambivalent about "grossly offensive" speech: most of the examples I find people moaning about are people being gratuitously abhorrent and should have known better. But again, there are examples of police and prosecutors getting it wrong.

But I think the leap from acknowledging that to "speech should never be infringed", as many freeze peachers would advocate, to be infinitely more destructive: just see what it's doing to America. Just look at what the infiltration of American-style freedom of speech principles is doing to this country: we have people defending Lucy Connolly, the woman who publicly advocated for the burning down of hotels housing asylum seekers, calling her a "political prisoner", that the government is "silencing the right".

One part where I agree with you is "From the river to the sea": there are two versions of this (more than two, but they are variations of the same thing), the first being "From the river to the sea, Palestine will be free", and the other "between the Sea and the Jordan there will only be Israeli sovereignty". Guess which one our government finds objectionable. And guess which one is being used to justify a genocide. It does bother me that the government can chill and punish speech that objects to its foreign policy. But I feel as if (this is just vibes, feel free to correct me) the most harm being done is through anti-protest laws, not grossly offensive digital communications: I personally know of multiple people who regularly post abrasive, if not downright virulent "silence is violence" type content online, but do not go to protests because they fear arrest, detention, and being fired.