Can't think of anyone that would object to the idea, indeed I think it should be the default.

I'm so sick of reading daily the scummy tactics these tech giants are using to hoover up private/personal data, and then reading their little acolytes on HN defending them ("Oh, it's probably just an A/B test, nothing to worry about!" or "It's too hard to monitor what our company is doing, even when presented to hard facts on the daily, what's a dev to do!").