The challenge for them will be if they get the same amount of downloads and traffic as they did on the App Store.So if there's somehow a mass migration of platform developers that suddenly make all their apps free with IN-APP purchases using direct payments outside of the Apple eco system.
They'll quickly change the future Developer App agreements where you have to pay way more up front.
If some apps are available both on the App Store and some third-party store, what is the user's motivation for using the third-party store?
If they have the apps and the in-app purchases at a lower price, maybe it's worth creating an account on the alternate app store but the incentive would have to be pretty big.
I have bought maybe a handful of apps in over 10 years on the iPhone. That includes in-app purchases and I have not bought one single subscription.
App developers have migrated to the subscription model but there's still a lot of utility from free apps.
For instance I don't subscribe to 1 Password. I just sync between the app and my Mac through Wifi. It would be nice to have it sync by itself but not worth paying for that service.
And some of my most frequently-used apps are things like banking apps so they're completely free. If Chase and BofA offered their apps on some 3rd party app store as well as the Apple App Store, why would anyone bother to get them through the 3rd party app store?
But some apps which are on multiple app store will probably find that they get a lot more downloads from Apple than these other app stores.
Presumably companies like Spotify and maybe Netflix will only distribute through other App Stores. So people who really want to subscribe to those services will have to install and create an account on these other App Stores.
So how many of the top 10 or top 100 apps which require purchase of some kind to be useful will migrate to other app stores to reduce their commissions? That is where the test will be, how many migrate away from the App Store and offer lower prices to get their users to follow them.
Or they may decide to distribute across multiple app stores but find that they get way more downloads and sales through Apple than others and net more profits there.