Quora begins making money with the introduction of advertising 10 years ago
Sure there are some spam and useless answers, but there are experienced users as well who contributing with great answers.
Everyone good on Quora is going to get "Church'd" soon enough. The moderators have done everything they can to drive out quality. The ban of Michael O. Church (who was a moderate, thoughtful member of that community, regardless of his divisive presence here) convinced me of that.
I also find it interesting that any Indian or Chinese woman with feminist views that would be considered moderate in the U.S. gets reported as a sock puppet and banned.