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You, and nobody can stop them from doing so. It turns out that web UI technologies are very easily and conveniently usable for OS GUI features as well. Browsing a file system? Web UI. Navigating settings and configurations pages? Web UI.
And these browsers are open-source. Chromium. Edge is a derivative of Chromium, so is Chrome. The fact that Google controls the Chromium upstream matters not at all, because anyone is free to fork it and modify to their needs.
Freedom is a double-edged sword, but this is many folds better than locked-in proprietary.
Of course they can be forced to provide a browser selection screen when installing the OS. What are you even talking about technology for, this is a regulatory issue.