the way they get around regulators, is they are selling the hardware and the users are responsible for downloading and compiling the software. they support alot of cars but they are utilizing vehicle sensors off the can bus and adas vehicle commands. if the manufacturer decides to encrypt or restrict this then the approach wouldnt work.
For that matter, at a certain point your car insurance might give you a big discount to have one installed and subsidize the installation and hardware costs. There's a profit motive for the first company that does so, being able to offer much cheaper rates while still paying out far less for at-fault collisions.
1. Older cars have a lockout on steering after 10 seconds baked into the EPS firmware.
2. While newer cars don't have this lockout, adaptive cruise control (ACC) is only on high trims. Therefore low trims lack radar and (possibly) continuous duty brake controllers.
It should be better in a year or two when ACC is standard on Ford. ACC is standard on Toyota, Honda, Hyundai, Stellantis, and Subaru, hence that's where the effort goes.
And people say comma is confusing.