I'd rather normalize knowing who's tracking me than normalize the tracking without me even having a chance to know.
You could imagine extending the mechanism to where users can emit a "don't record me" beacon.
There's precendent for the emission signal in Do Not Track, but I don't think the result is what you want.
Even if it was successfully implemented it wouldn't actually at all tell you whether you're being recorded or not. Then what's the point?
The GDPR has serious teeth - by there are still a large number of companies that flaunt the regulations. Like OATH.
Anything the user says to try and opt-out will be used as nothing more than an identifier to continue to track them.
We've already seen all this play out in the websphere. We do not want this to happen the same way in the real world.