You write here "And I didn't claim that it was", but you'd claimed initially "That's a completely different situation". (
https://news.ycombinator.com/item?id=31834544)
I'm not seeing your more recent statement as consistent with the first, given my own response: "Open source without the option for an alternate development organisation to drive or steer development direction means vey little."
Again: Microsoft's locus of control was not based on source code or standards, but on its control over the PC desktop market. MSIE shipped by default with that desktop, and any other browser, including Chrome, had to find its way to that desktop.
Microsoft has now ceded its own browser engine (Trident, I believe) for Google's (Blink), with Microsoft Edge. As this browser still ships by default with Windows, Chrome owns that platform by default.
Google also controls its own operating systems, Android (mobile and tablets) and ChromeOS (Chromebooks). Given Android's overwhelming numerical advantage in overall devices,[1] Google effecitely have Microsoft's previous leverage mechanism to themselves.
Google as the dominant search provider have an advertising advantage in advocating their browser, both within search and on Google properties with "works best with Chrome" or equivalent.
And again, Google effecitvely dominate both development of Chrome and Chromium, including gatekeeping over what code makes it in to each project, and through its own browser development, dominance within WHATWG, and ranking preferences withing Google Web Search, as well as compatibility favouritism through popular Google properties such as YouTube, Web standards themselves.
Microsoft's monopoly lock-in had a single peg, Google has four (OS, promotion, Chrome development, Web standards).
I do have to admit though, yes: It is a completely different situation. Microsoft's advantage was far weaker than Google's now is.
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Notes:
1. "As of April 2022, Android, an operating system using the Linux kernel, is the world's most-used operating system when judged by web use. It has 43% of the global market, followed by Windows with 30%, Apple iOS with 17%, macOS with 6%, then (desktop) Linux at 0.98% also using the Linux kernel." https://en.wikipedia.org/wiki/Usage_share_of_operating_syste...
My point was merely that Chromium being open source changes the equation pretty fundamentally compared to the IE situation