Epic, btw, has the exact same kind of agreement with Sony, Microsoft, and Google, for access to their gaming platforms. All three of those companies are extracting the same 30% fee that Apple is.
But now Epic has decided to grandstand and pretend that Apple has a "monopoly" and protest paying Apple, while still happily paying the exact same fees to its other gaming partners, including to Sony (for PlayStation), which just invested $250M in Epic.
So to say that there is "absolutely no basis" for Apple's action just isn't true.