One thing you don't understand is not everyone knows or even cares or has enough energy to fight for privacy. Not everyone knows how bad tracking is on websites or hell even know about tracking. Not everyone is a computer guru and can figure out how to use Linux and use a bunch of open source confusing programs. It's a balancing act between privacy and convenience. It's sure as hell convenient to use a default Samsung,apple, Google, LG, phone but oh the other end of you want max privacy you have to basically make your own phone from scratch which almost no love is going to do.
Most people don't know or have the energy to care about companies watching them 24/7.
I'm only using connect because it has the hide read/scrolled past post feature. With all the other apps I've tried and I've tried them all they always show the exact same post for like a day straight because they don't go away when I have already looked at them.