Apple sells huge amounts of ads, I believe it's the fastest growing part of the business right now. Estimates are $5 billion in advertising revenue in 2021, with one projection of $20 billion annually within 3 years. In addition to this, Google pays them $15 billion to be the default search engine and sell ads.
https://www.ft.com/content/074b881f-a931-4986-888e-2ac53e286...