I don't think that's a credible argument. Apple, at best, has about 55% smartphone marketshare in the United States--and significantly less in most other countries.

Remember, having a monopoly isn't itself illegal; it's using the monopoly to disadvantage competitors, especially in emerging markets, which was what the Microsoft case was all about.

I don't think there's a legal justification for suggesting that Apple creating a private feature only they can use--for now--gives them unfair advantage in the market.

I wouldn't be surprised if Apple makes it a public feature in a future release of iOS 26.