What do you mean? 15 years ago other phone app stores charged insane fees if you could even get on the store. At the time, 30% was seen as a huge win for developers.
And even if someone did suddenly find Apple's policies unacceptable, there are several prominent alternatives to switch to, and switching is really not difficult for the vast majority of people. To be clear, there are some cases where Apple (and competitors) do make switching more difficult, and I do think it's reasonable for regulators to look into that stuff.
Apple is half of an entrenched duopoly in the mobile market. It is reasonable to restrict trillion dollar monopolies (or oligopolies!) from imposing a 30% tax on all web transactions. Not merely to restrict them from making it difficult to switch. It's unacceptable. It's exploitative. It's antitrust behavior. It's got to stop.