Im not going to pretend that i understand or know everything regarding the gaming industry or how much money apple developers earned and how much they paid.
But one thing is for certain, the only reason Apple has managed to charge 30% is because they had 0 competition inside of their OS, no competitive app stores, web browsers were same as safari with their unique UI Skin on top, so again they could not be better than Safari only same or worse in some cases.
If you are the only game in town that does not leave your developers or users any wiggle room or effective choice.. you either pay up or dont access billion + people that have apple devices.
From a business perspective thats foolish as you effectively reduce your revenue.
Paying apple 30% still gives you 70% of the revenue you would have not had.
But as an example, i am a web developer and we sometimes develop progressive web apps that function more less the same as native apps in the apple/google store.
On Android/Windows/Google Chrome when you install the web app it offers roughly 90-95% of the functionality you would get from the native app in their respective stores.
Apple has refused to enable full functionality that Progressive Web apps can provide to their users so currently Apple/Safari offer between 80% of the full functionality because they intentionally gimp it so it can not compete with their app store.
also, its important to mention that Progressive web apps are excluded from apple/google tax and only thing you pay is 3-5% for payment processor of your choice which is amazing for developers and companies that decide to take that route. However most companies know that apple userbase are simple people who dont know how to install/enable/use progressive web app so they launch their native app and eat up the 30% tax just to get access to larger userbase.
Over the last 3 years we have developed roughly 10-13 web apps that act as native ones and that number is on the rise, so more and more small/medium sized companies chose this route, and EU rules might make it easier, but it remains to be seen

It will be a long year with lots of re-adjustments for both Big Tech and developers/users.