If a user has an "opt-out" button or signal it should be wired up to a system that functions as such. This is just a software engineering, you could vibe-code a fix in ten minutes.
I genuinely believe that people are insane to think otherwise, proof is that there has been millions(billions?) issued in fines for non-respect of this specific issue, why are people still having "hope"? It doesn't make sense, it's THERE, it's in THEIR DB.
The same goes for LLMs of course, every prompts is recorded and will be used, be sure of that.