Perhaps most interesting, Musk is also interested in having Tesla join the sharing economy, potentially putting pressure on ride-hailing companies like Uber and Lyft. Until Wednesday, Musk hadn't addressed the idea of a vehicle-sharing service. During an earnings call in November, an investor asked Musk about the idea of creating a sharing-economy-like service for Tesla, similar to Uber. "There is a right time to make announcements and this is not that time," Musk said at the time. Now, apparently, is the right time for such an announcement. Unlike existing vehicle-sharing start-ups like Getaround, which lets users rent out their cars to others, Tesla's program would only use its own autonomous vehicles. "When true self-driving is approved by regulators, it will mean that you will be able to summon your Tesla from pretty much anywhere," Musk wrote.