We’re talking about access to the internet, something that people are increasingly acknowledging as a primary need. Regulations will follow.
I'm certainly not happy with how Google is using their position, but is it illegal? Should it be? Even a Pixel phone can install and use Firefox. You might perhaps make a case out of how all SDK WebViews end up being Chrome (-ish), but as long as a third party app embedding their own web view would not be rejected by Play, that's still more open than significant other parts of the smartphone market. Sure, Google is using a position of power and everybody who isn't a major shareholder shouldn't exactly be happy about it, but itvit abusing? In a way assailable on legal grounds?