Otto sold for 680 million to Uber in August 2016, the company started in 2015, that's atleast one company that was willing to sell and I figure most of them would, they all have no end game other then being acquired for the most part
http://www.recode.net/2016/8/18/12540068/uber-paid-680-milli...
time will tell if the Cruise acquisition pays off or not