> "does Apple’s walled garden prevent the creation of businesses that consumers would like to do business with if only they had the opportunity"

They already do prevent certain businesses from operating in the App Store anyway, irrespective of the regulatory scrutiny here. An example is present in Apple's review guidelines, where they specifically ban any apps that encourage consumption of tobacco products or vaping. See https://developer.apple.com/app-store/review/guidelines/

> 1.4.3 Apps that encourage consumption of tobacco and vape products, illegal drugs, or excessive amounts of alcohol are not permitted on the App Store.

The same goes with all apps that feature pornography or facilitate prostitution and I'm sure many adult-entertainment businesses would love the opportunity to do business in the App Store. I'm not saying Apple should or shouldn't allow those types of businesses on the app store, mind you, but there's no law saying Apple must allow even dating apps on the App Store; if Apple decided they could probably ban dating apps altogether.