Is there anything like an #ActivityPub based #Wikipedia alternative? I think this would be a really cool project, and if it doesn't exist, it should be created. I would be happy to help write the concept, but most likely not the programming side.
If you are wondering why this is important, the gist of it is that Wikipedia is also a centralized platform, just as much as Twitter or Facebook. This causes various problems, like administrators having too much power and banning users they don't like. Articles are generally written from a capitalist/neoliberal perspective, while leftist viewpoints are censored.
https://wikipediocracy.com/2015/08/16/a-compendium-of-wikipedia-criticism/