Comment by sneak

The answer: because Meta has deliberately and intentionally inserted themselves into the social fabric so they can use network effects to surveil you sell your personal relationships back to you. They bought up Instagram and WhatsApp to the same end, then Oculus. Even Carmack fell for the lie. Meta never wants you talking to anyone in any medium without them knowing about it, because it allows them to sell more and more ads, because nobody is going to give up communications with their friends and family.

It's not that complicated. Most people just go where the other users are. They "have nothing to hide". Their thoughtless decisions actively make society worse for everyone else, one user at a time. Even tech people who know the scam throw up their hands and express how impossible it would be to get their kids' soccer parents or PTA groups to abandon WhatsApp groups or FB Messenger for something privacy-respecting. The tyranny of the installed base.

Go to a place that didn't have deliberate large scale society-wide anti-smoking programs. Basically everyone starts smoking at age 15 and never stops. People regularly and typically, en masse, work against their own interests in ways that seem like "not a big deal".

Suddenly, you can't make a doctor's appointment in Europe without a WhatsApp account (and agreeing to the Meta ToS in the process). (Why Europe casually ceded the basic day to day communications of many of its b2c sectors to an American company without so much as a fight is another matter.)