I wonder what percentage of cars on the streets of Manhattan are Uber/Lyft, vs. taxi cabs, vs. private vehicles vs. other commercial ones. Claiming to limit Uber license to alleviate congestion is a bullshit argument unless you can show that they make up a significant percentage of traffic. Also, to be clear, I'm not an Uber apologist; they can go fuck themselves as quickly as they move and break things.
What's wrong with a vast majority of the vehicles on the road not being owned by the people who use them for transportation? It seems that a large amount of people don't want to purchase and maintain a vehicle they might not always be using and instead pay on-demand like they do for many other services where someone specializes to reduce the cost for others?
If Uber+Taxi make up a small percentage of traffic, then limiting them to fix congestion seems like a stupid idea.