Wikipedia has a challenger in the category of user created encyclopedia content. Everipedia (the encyclopedia of everything) is based on a blockchain model. The new platform is being promoted by notables including the cofounder of wikipedia. I am not certain I understand the logic of why a blockchain approaches offers an advantage or why a competitor is necessary. I guess this venture promises benefits to contributors beyond the satisfaction of sharing their knowledge. This is not an endorsement, but I do think it is worth a look.