Internet enabled cars were never a good idea. I dread the day I have to give up my mid-00s Honda and replace it with something new, since everything seems loaded with phone-home spyware and killswitches now.
I'm sure we'll figure out the regulation sooner or later, but for now it looks like things will get worse before they get better.
https://www.toyota.com/audio-multimedia/support/3g-faq/
https://www.subaru.com/support/3g-network-retirement.html
Etc.