I'm okay with Apple charging a fee for hosting apps...and they do, via the annual developer fee. The problem is with Apple forcing developers to do other thing

I'm okay with Apple charging a fee for hosting apps...and they do, via the annual developer fee. The problem is with Apple forcing developers to do other things unrelated to the hosting of apps, such as giving up 30% of unrelated transactions (like events, etc) that would have occurred even in the absence of the app. And indeed, that is at the heart of the EU and US antitrust investigations.