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.
UN literally never pretended to do such a thing - it's just a forum for countries to meet and discuss issues, with no power to really do anything other than agree or disagree with each other on whatever is being discussed. Kicking out say Russia or China or North Korea from the UN makes no sense in that context, because you can't have an international forum for discussion if you are not letting countries in to actually you know, discuss.
I think it stems from the idea of UN that people have in their head, maybe it's embedded by the popular media or otherwise, but I see people complaining that UN doesn't force countries to do X or Y. That's literally not how it works - it's just a forum to talk, nothing less nothing more.