If they allowed 3rd party app stores or let users install apps directly on their phone, sure. But why should Apple get 30% of a subscription between me and a co

If they allowed 3rd party app stores or let users install apps directly on their phone, sure. But why should Apple get 30% of a subscription between me and a company? You could almost argue that it's worth 30% for the initial discovery in their app store (meh), but I just don't get how anyone could think it's fair for Apple to take 30% of a subscription, when developers don't have a choice but to use the platform.