

Frankly, the answer should be for every site to just cut the UK off entirely.
Tech corporations own most popular and visited websites/services, they are not going to do it. That said you have countries with major websites blocked like russia or china, while it upset many people censored internet is also a strong tool to brainwash people so don’t assume a blockage would lead to a positive outcome.
While not secure it could still provide a free and censorship-less alternative to the internet