It's because of the government regulation and how localized it is so you can't pick a fight with just one regulator to force them to stop doing stupid, you need

It's because of the government regulation and how localized it is so you can't pick a fight with just one regulator to force them to stop doing stupid, you need to pick fights with tens of thousands of local regulators (and their tens to hundreds of thousands of unionized government employees). On top of that, building is super capital intensive with long lead times to profitability that are fully controlled by said regulators so you can't pull an uber and just operate on a moderate sum of angel investor money while you also earn money from your service and flip the bird to the regulator. You don't make any money until you beat the regulator into submission, which makes beating the regulator a bad investment. On top of all the above, you have teh general populace, of which a significant portion own housing they want to see go up so you won't ever get to the point where everyone sees the light and overwhelmingly supports you like uber got to, there will always be significant push back from the populace who want to abuse supply constraint to increase their personal benefit at the severe cost to all of us.