Don’t blame Mark, he’s one of my neighbours.
The core problem is I think back at everyone who uses Facebook, the premise of a free lunch. The expectation of something which scales to millions of people, where you can get instant ability to see what all your friends are doing, post photos, videos, live chat, etc.
That follows a long line of similar free lunch expectations, Google for example. Gmail is free, search is free. Android is pretty much free. But then Google knows all about you too.
If you want privacy you have to pay for it, or not use the service at all.
I found myself not using Facebook basically because it became annoying, too many adverts and targeting me. I can type fast, I can read fast, but to scroll past all that crap just became annoying.
On my Chromebook (typing now on) I have Adblock Plus extension, and Ablock for Youtube to stop the same crap.
On my Android devices, I only buy ones which can be unlocked bootloader, rooted. Magisk, Xposed, Adaway, Minminguard, to block all the ads.
If I am blocked from a site due to my ad block, I open Incognito so the cookies it drops to infer my interests do not carry over into another site where they attempt to sell me something.
I do not think you can shield yourself from 21st century knowing everything about you. At most, you can just shield yourself from its worst annoyances. If you were wanting to shield yourself from all of its annoyances, you can dial back to the 19th century, where plenty then thought themselves sophisticated.