 Rivian is banking on the anti-Tesla crowd as well as an infusion of cash from its tie-up with Volkswagen to keep rolling on. A Gartner analyst says Rivian is doing things better than Tesla in a lot of ways, but Tesla had the market to itself for years. So that leaves Rivian looking to lure a customer base that's been reluctant to take on EVs. Gartner says Rivian is going to have to make a much cheaper car.