Are we (users) perhaps partly to blame? Maybe we do let them get away and they know that? How many people are really going to delete their profile now? (instead of just opting out) Perhaps we should be more principled in our response to such things? Imagine they lose 90% of their user base because of this idiocy. May be that'd serve as a broader lesson of real ethics?
I remember well when Quora forced me to install their app on mobile (not just a reminder pop-up, they blocked the page fully) - I sweared to never use them ever again. I kept my promise for a year or so, and then somehow went back to reading it later; so I am guilty myself of not being principled. But these sort of decisions really really puzzle me.