That was part of a widespread protest against proposed bipartisan internet legislation in America.

On that occassion, it was very effective at getting the American government to back down.

Yet this looks nothing like their reaction to SOPA and PIPA. They even explicitly state that Wikimedia is not against the legislation on the whole.

> The Wikimedia Foundation shares the UK government’s commitment to promoting online environments where everyone can safely participate. The organization is not bringing a general challenge to the OSA as a whole, nor to the existence of the Category 1 duties themselves. Rather, the legal challenge focuses solely on the new Categorisation Regulations that risk imposing Category 1 duties (the OSA’s most stringent obligations) on Wikipedia.

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I personally find it rather frustrating that Wikimedia is suddenly so willing to bend over for fascists. Where did their conscience go?