There isn't guesswork involved. They know for certain that people will. They have network effect on their side. Their entire audience is captive. Anyone willing to leave already has after the hundreds of different "revelations" of how fucking disgusting everything they have ever touched is.

They aren't selling anything but your privacy. It's Apple's limitations on being overt malware that they'd be bypassing, and it is absolutely guaranteed that they would do so the literal minute they can.