The problem with the drivers license analogy is a startup "uber for bus" for example really would need a CDL with passenger endorsements, not just the standard

The problem with the drivers license analogy is a startup "uber for bus" for example really would need a CDL with passenger endorsements, not just the standard drivers license. The legal logic explaining taxis not needing state licenses vs bus and transit vans needing CDL with endorsements is strictly vehicle weight based. This is essentially the uber loophole. Although state DOT logic would imply "uber general aviation" would be OK, the FAA has never felt the need to obey state DOT logic, which overall is probably good.