Cool, so from Google's perspective this is probably an absolute best case scenario: Firefox users tend to be more savvy than iOS users, and Yahoo still claimed

Cool, so from Google's perspective this is probably an absolute best case scenario: Firefox users tend to be more savvy than iOS users, and Yahoo still claimed at least 25% of users. So, 3bn is peanuts for 25% of mobile ad revenue, which for google is 50bn/yr. Apple would probably have to raise the price several times over before Google starts questioning this relationship.