But that’s the point I was trying to make - the poster in question was being melodramatic and , while I certainly prefer the US approach to freedom of speech, no British posters are actually in any danger and there’s nothing “chilling” about it.
You can’t say stuff that might prejudice the outcome of a trial, under some circumstances. But sub judice rules are actually quite limited, and there’s no reason at all why British posters should refrain from discussing their opinions of this new law. None at all.