I do think it's stupid we had and continue to have laws that say it's illegal to offer someone a paid ride if you notice that they need one with your own senses ("hailing"), as opposed to via a phone call or app notification.

Maybe many people share this view, and that solves the mystery: people haven't only started caring recently about the local regulations; they started caring about the completely different issues that only recently came to light: backoffice culture problems, reckless administration of the self-driving car project, worsening conditions for unskilled freelancers generally, etc. That explains how it could be that suddenly lots more people are averse to Uber, and yet no more people care about taxi businesses or their legal moats than before.