Google makes something like $100 Billion a year in search ad revenue. 5% of that is $5 Billion.

It's odd that people think Google is incredibly worried about having too large of a market share in the browser market (which they don't make any money from) yet their 92% market share in searches is not concerning at all in terms of the potential for regulation.

The truth is nobody does anti-trust anymore (though they definitely should) and the big corporations aren't worried at all about it. Google makes Chrome, Android, and pays Mozilla because they want to maintain dominance in the search market. Which is the thing they make money form. What they pay Mozilla is a drop in the bucket compared to what they pay Apple to be the default search engine on their devices.