I don't think any of those companies was started with the intention of becoming a nonprofit sustainably tying together the community, as this article seems to c

I don't think any of those companies was started with the intention of becoming a nonprofit sustainably tying together the community, as this article seems to claim. This isn't the emergence of a sharing economy - that makes it sound like we're moving from capitalism to communism. What we're seeing is companies utilizing the Internet to bring together markets that would have been impossible to organize profitably 20 years ago (try running eBay as a mail-order or phone based system).