[usrusr]

Sounds a lot like the saying that it's easy to keep honest people honest. But that's about keeping people to rules that, for all practical concerns, have been there forever. Regulation is often dealing with quite the opposite. When you decide one day that it's not ok anymore for a chemicals plant to just dump spent reagents in the river it's about changing behavior, not about preventing bad habits to form. That makes it much harder.

Another question is how closely the behavior in question is related to the income streams: the chemical plant won't sell less if they avoid unprocessed dumping. Chances are they can even convert part of their waste into sellable side-products. And if a hotel chain had a little side income from selling Wifi communication metadata to ad networks they could stop doing so any time without changing the tiniest thing in their core business besides some minor numbers in the balance sheet. But Facebook doesn't have any business outside of ad targeting and telling them to stop some forms of data collection almost seems like an attempt at winning over Henry Morgan to peaceful cargo transport.