eg Google, Facebook, etc.
People not using those services seem to be doing ok. :)
We only have their word to go on, and absolutely no way to verify, afaik.
I kept getting the "eyes rolling look" when I mention my partner and other relatives friends I don't want them to post pictures of me online and I have very little way to make sure they don't. The only way is to refuse being photographed and basically avoid social events. You shouldn't have to be forced into antisocial behavior to make sure you aren't being tracked.
And I am only talking about photos, there are many other ways to be tracked and identified.
Depending on where you live, you'll still be on probably dozens if not hundreds of security cameras as you go about your day.
It reminds me about the furor over so-called "glassholes" who filmed people while wearing Google Glass. People were outraged when they saw that they were being filmed with cameras that were right in their face, but don't care the that dozens of (mostly invisible) security cameras film them daily.
Zuckerberg himself indirectly confirmed this: https://web.archive.org/web/20211006190710/https://www.getre...
Google have been so far good stewards of your data so nothing to worry about.
https://www.consumerreports.org/privacy/how-facebook-tracks-...
