There are companies that scan every parked car visible in any public accessible spot.
e.g. at BigBox Mart towtrucks will traverse the parking lanes, with ALPR cameras quickly detecting repos to snatch.
My car is paid for but I just don't display a license plate period (in my US state it's only a $10 fine to not).
The real question is why do they only sell information to services designed to cause harm.
Fun fact: Motorola Solutions sells LPRs not only to law enforcement (via Vigilant Solutions), they also sell them via the "Digital Recognition Network" arm to third party companies - tow operators, private operations, and so on.
Some of the largest customers of DRN are banks, especially sub-prime lenders :)
https://drndata.com/about/
https://drndata.com/news/motorola-solutions-acquires-vaas-in...
And all of them... feed right into the greater LEARN (Law Enforcement Archival Reporting Network) system that the feds and company have access to at all times.