I don't see the point in paying extra to have an ID on my car that tells The Man more about me than I think they need to know
Literally what on Earth are you doing to your license plate that tells The Man more about you in a way that realistically matters? You don't need your Ashley Madison credentials to create a custom plate.
If you're worried about dragnet surveillance, I guess it'll help them when they divide the prison camps by baseball team. If you're worried about automated surveillance like by ALPRs then, uh, pretty sure the model whose literal entire purpose is to create its own features for classification will find abundant other ways to uniquely fingerprint and extract actual, pertinent information about you. And if you're worried about targeted surveillance by humans scrutinizing you down to what your custom plate says about you, then god help you, and viva México.