With money at stake I suspect you'd be dealing with voting, and quality issues up the wazoo.
And as a n00b myself, the n00b developer community eats up just about any garbage, and as you see on reddit will vote it up like crazy with at most some thought of "thanks for posting" Every programming sub is now r/learnprogramming to some extent, and there's no way for the n00bs like me to really KNOW if we learned something right, we just learned a thing and we think it is great so upvote! If a platform gets popular at all they're going to have those issues.
Measuring quality... even just viewing it on the administrative side would be a mess, and community participation would be a real pain.