You don't see the point that Apple is bullying the developer who earn more in sales revenue due to a greater amount of hard work and creativity went into the application by increasing the fees and imposed restrictions such as the third-party payment system.
You earn more you pay more taxes. That is how it works the world over. That is Apple's compromise to make it better for startups and small businesses. There is no downside to this. You are ether so big you pay the industry standard rate or you are small enough you get a bigger share. 30% was already far better terms than the EPIC game store, retail, and everything else before the AppStore.