An advertising company should not be allowed to abuse its monopoly on the most-used* browser. It's a pure and simple conflict of interest, as illustrated by its attempts to cripple ad-blocking extensions. At the very least, it should have to be kept at arms length from the core ad-slinging/user-milking aspects of the business.
*Note that I intentionally don't say "most popular" or "favourite". A very large fraction of those using it probably don't even really know what a "browser" is: the various strong-arm tactics** that Google has used to achieve such dominance are a fundamental part of the problem.
**I also note the almost amusing situation of Microsoft trying to do the same very heavily for Edge and Bing, but failing miserably.