By "ignore it" I mean "ignore the law", not ignore the UK market. At some point the idea that countries can regulate the internet outside their borders falls apart. The US succeeds in enforcing its gambling laws WRT Americans, but that only works because other nations agree to do the enforcement.

I just don't see that happening here. So maybe the UK becomes a no-travel zone for anyone in the worldwide tech industry? That would be sad, but it's a plausible outcome.