Opt-out still goes through their servers, which means unsecure. We use encryption everywhere to not trust the middle layer, if it transits somewhere in cleartext, then it's logged and eventually used later-on.

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.