Yes, because you had no choice and no alternative. Apple's won't allow anyone else to host an App Store on "their" phone (that you think you own).
I have lots of alternatives to sell apps. I can sell fully functional apps and games on Steam, Google Play, or directly in the browser so you and use and play directly in the browser. Steam is also 30%. Selling directly and via Epic is still the most expensive by far but you can do it.
If I am targeting iOS directly I can sell on the App Store knowing well in advance what fees I'll pay or I can sell a web app and work out ahead of time all the costs involved.
I am not beholden to Apple's rules and never have been. And at least I let my work stand on its own, these two developers failed and became millionaires from it.