I think that this time around it's not actually something that falls under US antitrust law. At the time of the 2001 IE antitrust suit, Internet Explorer had 90% browser marketshare and was using it to prop up the dominance of Windows as well. Many websites relied on IE-only features such as ActiveX controls, so you could get shut out of things if you didn't use IE, which in turn meant you'd be shut out of them if you didn't use Windows.

Nowadays, Microsoft's behavior is undeniably shitty. But Edge's 10% or 15% marketshare is hardly a monopoly, so I don't think it falls under the jurisdiction of antitrust laws. Though I certainly wouldn't cry to find out that it falls under some other kind of consumer protection law.