I'm not sure how you think it works. Do you think there's some kind of Supreme Court precedent making it illegal for OS vendors to bundle software?
Microsoft didn't lose the antitrust case. It was overturned on appeal, remanded to a lower court to try again, and then the government settled out of court.
From the Wikipedia description of the settlement: "the DOJ did not require Microsoft to change any of its code nor prevent Microsoft from tying other software with Windows in the future".
What's more "Microsoft’s obligations under the settlement, as originally drafted, expired on November 12, 2007."
Ah thanks, that explains a lot. I did actually think that case set the precedent that way, since MSFT was totally defanged by then upstarts over the next decade.
Still doesn't explain why Edge is bundled with Windows and why I can't uninstall it from my PC without going to the system files.