I also live in Austin and completely agree with you. Unsolicited text messages are no way to endear yourself to people. But the radio in my car was broken so at least I was spared of those ads, and I never received any physical mail either.
But my real qualm is that these companies used to be start-ups. Now that they are so huge, they have become just as stubborn to change as the Taxi companies. Nicht Gut, Uber. As this will only allow competitors to enter the market and take over.
Also I would not be surprised to see other areas adapting similar regulations on ride sharing services, as to be honest they seemed pretty reasonable. Are they going to spend $200 bucks per vote to lose again? I bet the spend even more next time, because apparently they've lost any sort of flexibility they had as a start up, so they would only see this as a problem of not having spent enough when really they should have just add the features to support it. Oh well free money to getme.com and others.