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That is indeed US-specific. I’m in the EU, and here it’s defined by when and how it’s switched. Specifically, it is required to be tied to the brake pedal (i.e. then intention to brake) and/or the hand brake being pulled. It is not allowed to illuminate otherwise. But the exact specifics probably also vary by country here. That’s why I emphasized that part.
EDIT: There are actually deceleration values in some laws, possibly tied to regulation of EVs and the regenerative braking. Since that isn’t necessarily tied to the brake pedal when silmulating engine braking, but can be adjusted in strength at will (it isn’t tied to the mechanics of the drag of an idling engine as it would with an ICE). A quick google told me that the lights are allowed to come on at 0.7 m/s² and are required to come on at 1.3 m/s². This obviously implies that they are NOT allowed to come on below 0.7 m/s². This still applies only to (pure) EVs, as far as I can tell (not hybrids, and not ICE powered cars).
If you got your way, the vast majority of the Internet would disappear together with the advertising. The Internet runs on advertising. If it stops being viable, so does the Internet as a whole. How do you think all these free services are funded?
The trick is to take the privacy violating and tracking part out of it. If you block ads, that doesn’t matter. If a few tech savvy people do, it doesn’t matter. If literally everyone does, it suddenly matters a lot.
Of course they are working with one of the advertising giants, that’s the point. That’s who the solution is for. If none of them would accept it, it might as well not exist.