Most people don't have enough knowledge to make an ethical judgement about it. So we do what's convenient and assume it's ok.
That's why I prefer to have proficient regulatory bodies with domain expertise to set rules, rather than expect for market forces ("vote with your dollar") to select for ethical options. Consumers can't be expected to make those choices, not at scale.
So I'm not convinced that "privacy" is really so controversial, even if people keep using Facebook. They don't know how facebook works, or in which ways its business practices "innovated" beyond the status quo that preceded it. Also, most people aren't interested in taking part in a futile boycott of something, even if they'd prefer for it to be restricted/banned for everyone.