The Doctorow school argument, as best I can tell, would go 'the regulations on black car service were meant for things like limo services that don't compete directly with taxis, and once Uber started competing directly with taxis, regulators and authorities should have moved more aggressively to write new regulations/laws that regulated Uber the same way taxis are regulated.' They would not agree with "the reason why taxis are tightly regulated are for reasons that mostly do not apply to Uber."

And this is exactly why I think the question of "what is the correct way to regulate car ride services" shouldn't hinge on incumbency bias towards taxis, but actually ask the question of what is best for participants in the market (which doesn't just include taxis and Ubers but also includes public transportation and its users, for instance). But that doesn't fit neatly into Doctorow's enshitification narrative.