Would you be ok with if someone is taking 30% + Taxes of what your earning?
You are looking at this the wrong way.
It's
Epic that's trying to take 30% of what Apple should be
earning.
Apple BUILT this theme park (Apple hardware). It rents kiosks (App Store) out for 30%
of sales of a particular kind in the kiosk. Apple also clarifies what items can be sold in each kiosk, and how.
This is why Apple spends so much time in keynotes talking about how many users they have (to attract developers, or kiosk renters), how much money the developers are making, and how many apps (kiosks) they have (to attract users, or park visitors).
This is why Microsoft, Sony, and Google also built theme parks of their own, and implemented Apple's model. Well...I'm not sure who did it first, but still.
Epic is trying to come into Apple's theme park for free, rent a kiosk for free, and thus pay Apple nothing. And they're trying to get the government to force Apple to allow this.
Then, they're saying Apple is mean to Apple's theme park visitors because Epic cannot sell anything in Apple's theme park anymore.