Many states already ban the private collection of license plate data.

Which states are those? I'd like to read the statutes.

https://www.ncsl.org/technology-and-communication/automated-...

A friend entertained the idea of a startup focused on a social dashcam site, where users can upload clips of bad drivers tagged with their license plate number, and smart dashcams can alert to bad drivers in real time. They got as far as asking a lawyer before it fell apart.

There's a nice list here with references to statutes: https://www.ncsl.org/technology-and-communication/automated-...

Just so we're clear, across all these statutes, the term "private" means "for private use". State and local governments can engage private firms to collect data in all of them.

I did not know that. I do wish I lived in one.

One just needs to store personal data on license plates then. Handy.