Contractors for Uber's AI Solutions business say the pay is good, but getting hours can be challenging. Bloomberg/Getty Images Uber is getting into white-collar gig work through its AI Solutions business. Four contractors said that the AI training roles pay up to $150 an hour. Getting hours — and keeping the gig — can be challenging, they said. On a May evening, a calendar invite titled "Project Sandbox Kickoff" popped up in the inbox of some AI training contractors who worked for Uber. It was