Earlier quoted context omitted.
Except that you're talking about a completely different situation - Microsoft was attacked for defaulting their browser in their operating system, which had majority market share. 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 An…
Because it's not about the operating system, but all the related services that are embedded in the browser. I use chrome because it ties with my google account which ties in with... pretty much everything. It stores a lot of my passwords, it ties in with my gmail, my google workspace, my shared extensions that gets installed with any other chrome browsers through this google account, other google apps like google doc…
The platform used to be the OS, but google effectively commoditized it and the new platform is the 'cloud'. If you're on MS your new platform is going to be OWS, Azure, etc. With google it's going to be google cloud, gmail, and so forth.
What's considered a platform has vastly changed.