[aptgetrekt]

Yes exactly. From the perspective of the user, macOS treats you fairly. Apple carefully words everything to shift the blame to developers for things like notarization. The message that appears when apps aren't notarized puts the blame on the developer by saying "This software needs to be updated. Contact the developer for more information". To the user who doesn't know any better it's the developer's fault. Apple takes great care to ensure users never blame something that has gone wrong on Apple themselves.

Users get a good experience on macOS and iOS so they will continue buying Apple devices which also leads to more people switching to Apple devices due to pressures of things like iMessage. Meanwhile developers are essentially forced to agree to Apple's terms to access an extremely significant portion of the market (especially when it comes to smart phones). Those terms effectively censor developer criticism by preventing developers from explaining their situation to users. If developers don't comply, their apps will be removed and their development certificates revoked on all Apple platforms. As a user Apple feels fair, as a developer it's painfully obvious that Apple is abusing their market position. Look at what's happening with Floatplane: https://www.youtube.com/watch?v=1QzHu-sjdB8

Unless things change, I don't think I will choose to purchase an Apple device ever again. But if their market share continues to increase it will be impossible to survive as a developer without releasing for Apple devices and to develop for Apple devices I will be forced to buy their devices. The App Store and everything Apple offers is certainly worth something. Is it worth 30%? Who knows. The market isn't what decided that fee, Apple and all other software storefronts have somehow arrived at that number themselves. With no realistic way for competitors to offer alternative software storefronts on iOS and Android at their own price to compete and bring fees to their true value, we will never know.