> It's easy for a company to build privacy-related features, if those features help sell products.

As I said in the GP, Apple's engineering investment in privacy is far beyond what customers understand and what helps sales. Lots of companies simply add the word 'privacy' to their marketing and do nothing about it that has an impact ('we use 256-bit encryption to protect your data!' seems popular on websites).

> And how much difference did they actually make? Studies show not much.

Which studies?