This isn't really the case with Chrome though - on Windows, I keep having my browser reset back to Edge with fullscreen ads, on macOS the default browser is Safari (and it keeps spamming me with notification advertisements to use it), on Android the default browser on most US devices is Samsung Browser...
It's hard to argue that Google is really abusing people to use Chrome when there's an uphill battle on every single popular platform for users to actually install it.
If Google is really pushing an inferior product, how will you argue for antitrust when the users need to go out of their way to use Chrome on pretty much every platform except ChromeOS? What's the equivalent antitrust argument here?
"Google doesn't want to freely give their server capacity to anyone for server-driven features" doesn't really make for a strong argument. How do we structure the argument here? "This browser is very popular so it needs to be taken away from its developers"?