They removed paid subscription several months ago. It seems that they can make more money from matching WhatsApp and Facebook social graphs than from annual subscription.
That's truly remarkable. Facebook doesn't make that much money per users (about $1/user/month, as best as I can figure). I know people who would pay twice that for a privacy-keeping subscription tier.
When WhatsApp did have subscriptions in some regions, it was 99 cents per year, not per month. Facebook in the recent times has been making more than that.
Did anyone ever pay for this? I mean, did they have some algorithm that concluded I and everyone I've asked were more likely to uninstall than pay, so we were never asked?