[integralid]

Adding to what others said, they can just let UK block Wikipedia, but as a foundation that tries to share knowledge I think they're obliged to try avoid that. So they're doing just that right now, by challenging the law.

[netsharc]

Wikipedia's "gone black" before: https://en.wikipedia.org/wiki/Protests_against_SOPA_and_PIPA..., IMO blocking access to the whole of UK would've been a big move that could've been effective.