It's really a regulatory problem, where I live my 2025 toyota has a big display saying "the car is unable to send or receive any data if you don't press press accept", pressing decline gives the car that out of cell range symbol. Doesen't prevent targeted surveillance nor mass government surveillance, but those are more about regulations too.
Recent Toyotas can have the DCM physically bypassed fairly easily by unplugging it and/or unplugging a fuse. You lose the front passenger speaker and bluetooth microphone, but those can be re-enabled with a bypass cable or manually jumpering them and putting in an 8v supply IC for the mic.
