That's a case where the developer of the app is selling through their own storefront, not being forced to use a specific middleman with a specific (and large) c

That's a case where the developer of the app is selling through their own storefront, not being forced to use a specific middleman with a specific (and large) cut in order to reach the users. Relative to the Apple/iOS situation, that feels qualitatively different. Apple's restrictions are even tighter than those of Visa and MasterCard, some of which have anyway been overridden by laws and/or court settlements. As just the simplest example, Visa and MasterCard have never in my lifetime forbidden offering and advertising cash discounts (even when they've forbidden credit card surcharges). Developers for iOS have no way to sell iOS apps cheaper than through the method facilitated by Apple (which would allow them to increase the app store price to compensate for the 30% fee), nor can they mention to their iOS customers alternative cheaper ways of purchasing content. Nothing in the previous paragraph has an equivalent in the indie developer world.