Groupon's promise to local business owners was that offering a Groupon deal was an easy way to attract new long-term customers en masse, despite the sizable up-front loss. History showed that that did not happen for many businesses who used Groupon.
Similarly, so much of Uber's marketing is targeted towards the supply side (i.e. drivers) and the promise of making more than they could at any other available job, with "flexible hours" and other dubious perks. This is just the latest article to show that that is not the case.
Groupon's and Uber's business both depend on acquiring and retaining the best local businesses and drivers respectively, and as these kinds of stories keep coming to light, I wonder whether Uber will be able to retain all the drivers they acquire. Lyft has focused from the start on making their drivers happy, which is a smart way to differentiate from Uber's mercenary mindset, but I also wonder if that is enough to really differentiate itself in the eyes of drivers, at least enough to make Uber really worry.
In all honesty, I am rooting for someone to beat out Uber. When I first learned about them about 2 years ago, I marveled at their business model innovation and their ability to execute. But everything I read (and personally experience) about Uber tells me that they are becoming the new Investment Bank, both philosophically and culturally.