Quota. ?share=whatever That to me sums up the site in its entirety. A content SEO Google cheater that tries to con people into signing up to boost its user numbers They should have looked to StackOverflow as a good example of how you build a proper community, and more importantly, nurture it. Good ridance.
Stackoverflow has of a lot of terrible answers that get voted up by people who aren't equipped to evaluate them properly, and closed threads when anyone starts actual substantive discussions. It also suffers from lack of decent rewards for contribution. That's not what I would consider a good community.
Despite what you claim as lacking rewards it seems to have thrived and attracted contributions. I don't really care what you consider a good community, or even accept the premise that there needs to be any notion of community. Why attribute labels, the model seems to work just fine.