> Unfortunately, that won't help. Your phone number(s) and your home address are already on many of your friend's devices under your real name. Apple, Google & Co already have your details [...]
While it's important to keep that in mind, the "this won't help" mindset is a classical fallacy: someone gotta start, and if (and when) it's widespread enough, it'l help all of us. Like higiene.
You don't spit on the roads, do you? Or do you shit out your window?
So if you implement that -- have a talk with your friends about it too.
Well not really, because *everybody* has to do it or it's useless, and since your phone number could easily be in 100 phonebooks that's alot of poisoning to do. And As soon as people start doing it in numbers you can imagine a malicious Google (or whatever) would implement anti-poisoning analysis.
I believe the only real solution, which is unpopular on this largely libertarian site, is to have stronger protections in law, making data about you your property and controlled as such, and penalties for misuse the same seriousness as theft. That's a long way from where we are now though.