Care to quote the part where the US government forced the browser choice screen like the EU did?

Did I ever explicitly say the US in my comment? No. However, the entire case against Microsoft was built on its anticompetitive practices against Netscape. And Microsoft lost.

In the US, "The proposed settlement required Microsoft to share its application programming interfaces with third-party companies and appoint a panel of three people who would have full access to Microsoft's systems, records, and source code for five years in order to ensure compliance."

By having full access to the API, MS could no longer give IE special privileges (for example, being the only default browser choice when a link is clicked to be opened). At any rate, it's not a stretch to imagine similar movements towards Apple's app store. The parallels are quite similar.

I specifically said in the comment that you replied to “Nor were they required to allow other default browsers in the US.”

The parallels aren’t similar. Apple has less than 50% market share in the US and even less in Europe. Every console maker does the same as Apple.

There is no percentage-based threshold for antitrust. Price fixing, anticompetitive activities, cornering markets, etc can all trigger antitrust violations. Mobile computing is a far more important and mission critical foundation of modern life than video gaming. This is why there's a big push for net neutrality. The Federal government has all the authority it needs to regulate Apple if they decide it's worth doing. I support reigning in big tech.