Apple absolutely does collect personal data from its users and uses that data to target advertising. They openly disclose this in their policy statements.
Stating that
They do not profit off your data
is unjustifiable when Apple makes BILLIONS from advertising.
They also have been fined by European regulators when their practices ran afoul of privacy law.
Just because they're not as bad as Google (quite a low bar) it doesn't mean they're as good as they try to sell you on.



It might also be from oxidation. There are a lot of ways that can happen, even directly through the walls of the tubing between the kegs and faucets if it's the cheap kind.