Here in Sweden, the use of license plate scanners has become the norm for basically all parking houses, bridge tolls and road tolls. Even if you don't install the app or become a "member" of whatever system they are using, the license plate scanners is still used to detect when you enter or leave, and in some cases they automatically look up your home address to send you the bill with zero interaction with the driver. Even if they offer alternative ways to pay, by for example sms, it still uses the license plate scanner when you leave.

The only political party to even mention this as a problem was the pirate party back 15 years ago, and even then it never became a major issue that got discussed. Like paying with credit cards rather than physical cash, people see it as convenience or just as the way things now work.