You can block trackers pretty easily, or just not visit those websites. You'll probably be a happier person if you just don't visit foo.com than spending any portion of your brief time on Earth trying to trick an ML model into thinking you're a single mother from Lithuania.

Also, if your friend gives someone else information about you, do you expect that you should be able to control it? I'm pretty sure many of the details of my life appear in other people's emails, voicemails, journals, etc. that will never have a "forget me" button.

I'm mainly suggesting that there are lots of ways to improve this situation, from market forces to legislation, and it's sad to see people wasting time on things that won't work.