"Apple doesn't know which ads I see"
ROOOOOOTFLLLLL!!!!!
You see the ads Apple is paid for to show you. There's also an SDK for that.
"You can sell ads as much as you like"
To display targeted ads you need the target. And the target is controlled by those who can profile users. If you can profile the user using your OS and your browser, while stopping everybody else to gather the same data, those wishing to display targeted ads have to pay you, and you only.
People understand it, cattle don't - they are the product.