This is exactly the kind of innovation Apple apologists don't realize they're missing out on in the walled garden. You could still have easy, centralized billing with all-in-one management and one-click cancellation, while paying 30% less for everything. Give the free market a chance.
Why do you think that's the only way? Payment processors have long been able to differentiate recurring transactions from one-offs. Capital One has subscription management.
How the platform and the vendor split that money is irrelevant to me, and I’m not convinced this would become cheaper - evidently consumers are willing to pay the current price, so why wouldn’t the vendor just increase their profit?
In the same vein: Games don’t cost less on the epic store despite their lower (compared to Steam) either, so as an end user it makes no difference where I buy games.
Maybe you like paying an extra 20%. That's your business. But fees like that affect the viability of lots of business ideas, including games. Having lower fees increases the pool of indie games.
You can't say a slave is free because their master is free to enslave them, and they're free to escape if they can. Sometimes you need rules to create real freedom.