globally all forum sites would just fold up because the UK has a stupid law
They can just block access from any UK based IP address and carry on as normal. Like many of them are doing already, including some Lemmy instances (although funnily enough, not lemmynsfw).
Emiline Pankhurst and the suffragettes were terrorists, and even called themselves terrorists. They won that fight didn't they despite plenty of reactionary "someone please think of the taxpayer" cowards.