It's a moot-point. Switching away from AdSense isn't going to protect you from surveillance, it's just going to change the pool of customers buying your information. All your iCloud data is a few clicks away for most NSA employees, and I don't think it's a stretch to suggest that they also have root capabilities on your iPhone. No matter how you slice it, Apple isn't going to give you privacy. The data you hold near-and-dear is already in adversarial hands. The game is lost before you even put your chips on the table, that's the consequence of agreeing with TOSes for more than a decade. Nobody wants to admit it, but privacy is literally unattainable in a digital era.

What Apple sells is security. They do a fairly good job with security, and their whitepapers are almost industry-leading. Their commitment to privacy is entirely lip service though, and the volume of their marketing seems to indicate the emptiness of that promise.