And I would, and I did, contribute to Wikipedia.
Until it became clear to me that they'd allowed antisemitic, anti-Israeli politics to warp their articles about things like the Holocaust, the 6-day war or the Israeli-Palestinian conflict to the point that no neophyte could get a neutral recitation of facts, but would be confronted with an enormously racist and biased perspective at every step.
Essentially, they became like the UN general assembly. A body pretending to represent free speech and human rights that's stuffed with illiberal violators of human rights. And I don't need to contribute to that, or even care if it exists.