Problem is many people signed up years ago and I bet they've changed their ToS and privacy policy 100 times since then without people noticing.
Facebook satisfied our needs to connect with our friends when it arrived. Now it's 100% ads. I used to have real discussions with friends, but the comment quality today is basically on par with youtube (if not worse).
Honestly that sounds functionally like democracy still.
People (not I) voted for policies years ago have have changed a thousand times since, with or without people noticing.
Officials campaign promising to serve constituents in some way (we can call this their Terms of Service), people elect them, then they change those terms often, sometimes dramatically, sometimes on day 0. Whether people notice or not seems to have little effect.
So there's no reason to stay on it.
I personally stick with direct messaging apps (Skype, LINE).