Apple just kicked Fortnite off the App Store

What happened to the days where everyone controlled their own domains/IP addresses/servers?

Why would anyone want to risk being deplatformed? I trust ICANN more than I trust Apple and ${CLOUD_PROVIDER}

> I trust ICANN more than I trust Apple

Then you haven't been paying attention. Apple at least has competition. ICANN is a government supported monopoly that has been systematically taken over by robber barons.

Apple is a government supported legal monopoly due to patents, licences and copyrights, so are many others, but they are too.

If Apple wasn't both the largest US phone maker and a legal monopoly, their behavior would not be as problematic, as you could (at least in theory, probably in practice too) sell other hardware to run ios/macos, or resell legally obtained, and modified software without Apple restrictions.

Whether their behavior is acceptable or not must be framed in a much larger picture. Companies are given legal rights by virtue of expectations of that being the best for society, and that's the metric that companies should be measured against.

Would it be good, and acceptable for society if all technology vendors/brands acted exactly as Apple regarding the App Store?

It's quite easy to answer that with a no, since clearly tying many frequnt small purchases indefinitely to a bigger purchase is not something that can ever increase competition. As it will form a less effective market, it can't be said to be desirable.