Oh, you believe that Apple isn't capable of spying on you? That this statement is based on absolutely nothing? Is that correct?
It's the best damn evidence there is: personal experience with detailed, professional observation and testing.
Erm, what professional observation and testing is then held alongside personal experience in terms of evidence?
Also, privacy is possible online. I know my RM username isn't at all at that degree of privacy, but I don't go OCD with the privacy concerns. It is indeed attainable if you're willing to purchase a VPN for general browsing, always retype passwords, websites and usernames (cookie-free browsing on private browsers) and whenever it is something that doesn't prevent you from using TOR browser to use TOR, privacy is already more attainable.
Then we enter the realm of privacy to do with knowledge of operating systems, hardware and settings, which is the part where Apple gives you nothing at all to work with.