KYC has been re-enforced because a lot of cheaters have been caught in the APP. If your privacy and personal info is so important than better stay away from it.
Facebook and Twitter are totally different because they earn through ads and traffic. While Pi Network does not earn anything except from it's supporters.
Facebook and Twitter could detect all kinds of abuser without KYC, why this project can't do the same thing (considering the website states the teams consists of PhD/expert) ?