Not without a patent + legal funds warchest to take on Apple, Microsoft, and the other tech giants they're not.
Take PinePhone for a example. They aren’t being sued by any top players, and they certainly aren’t being banned at the domain level.
If you want to exclusively download apps from the App Store and exclusively make in-app purchases through Apple's payment system, you are 100% free to do so, even if others are able to choose differently.
My point with PinePhone is that if someone wants to make their own platform that uses a different payment processing system, they are free to do so, much like PinePhone has done.
This isn’t comparable to the railroad monopolies of the 1800s like these anti-trust laws were intended to effect. Because no one is forcing anybody to use Apple products. If you don’t like it, simply use something else. No one anywhere is being forced to use Apple products. The idea that the government should force Apple to make changes to its systems both sickens and disgusts me.
There is no U.S. antitrust provision that would force Apple to place a backdoor in iMessage. And if iMessage is compromised in certain countries where secure messaging apps are banned (such as China: https://www.reuters.com/article/us-china-apple-icloud-insigh...), iOS users would benefit from having the option to sideload apps like Signal and use them to communicate securely.
Forbidding one company from taking anti-competitive actions against smaller companies that increase the prices its users pay for products and services is not taking away from your rights. If you don't want to download or purchase anything through means not endorsed by Apple, you're not being forced to do so. The App Store and Apple's payment system are still available to you. The idea that others should conform to and pay for your preferences is antithetical to the notion of freedom.
https://www.scribd.com/document/555427906/22-01-27-Utah-Et-A...
U.S. antitrust law does not require the existence of a monopoly for a violation, just sufficiently anti-competitive behavior. High market power strengthens an antitrust claim, and iOS being part of a duopoly fits the mold.