The sharing economy exploded in China this year, with companies for all kinds of shareable objects taking part in this new business model. While there are businesses familiar to Westerners—shared offices, cars and rides—there are also ideas that seem a little kooky, such as shared basketballs and umbrellas. Although some call it innovative, many realize these companies are just “rental 2.0” companies, assisted by digital technology. As the concept reaches fever pitch, however, it is also facing a reality check, especially as many firms, ballooned by venture capital funds, start to show signs of failing.