I'm sort of in the middle on this. I think their anticompetitive behavior needs to be stopped. Google should be forbidden from entering into agreements to become the default search engine and should be forbidden from making Play Services mandatory on any Android device. Beyond that, I think the problem is a bit more organic.

Most browsers use Chromium to some extent. This is mainly because it's the most secure browser engine. The flip side to this is that web standards have become such a monster that creating a secure browser is a massive undertaking almost on the level of an operating system. In the course of normal web browsing, we are constantly loading and running random code, and you'd better hope it's confined well.  This high barrier to entry means few viable browser alternatives emerge and monopolies are all but inevitable.

Separating Google from Chrome might seem to solve something, and maybe it does solve something, but I don't see how it improves the situation that caused the browser monopoly to begin with.