Your argument isn't as strong as you'd like. Microsoft having a Windows monopoly wasn't illegal, what brought their antitrust case was distributing IExplorer with Windows, taking market share from Netscape.
But in 2023, are there any operating systems that don't ship with a built-in browser? Is there any reality in which the browser isn't an integral part of the operating system?
And then there's also the fact, which people forget, that IExplorer was a technically superior browser to Netscape's Navigator. It took a revamping of the organization, and of the product, to come up with a Firefox that could compete.