So just because someone’s poor it’s ok that Facebook treats them like a chump (invade their privacy and show them dumb ads), because they offer their product for free?

Facebook doesn’t give a rats ass about equity. If they did they’d copy a model like Apple’s App Store: as developer you pick a price tier for your app or subscription. That same tier translates into for example €2,99 per month in Europe, but the equivalent of €0,25 in less privileged markets. So the luckier people of the world subsidize the less fortunate, as it should be.