That aside - You're missing the forest for the trees.
No one is saying Apple is not providing a service, no one is arguing that they shouldn't be able to charge what they want for that service.
Everyone is saying that it's bullshit that Apple is the only service you can pick if your users are on iOS.
Basically - Why is it fair for apple to arbitrarily prevent the installation of any competing distribution methods?
Because from my perspective - It doesn't matter how great you think Apple's services are, you can't have an honest and informed opinion when they only ever let you see that one walled garden.
Epic is literally in the same market - They have a store, they developed a distribution channel, they paid developers, designers, QA, support, etc. But Apple has said "Nice store you've spent all that money building, such a shame we've decided we won't allow you to use it on an iPhone."