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Re:Play.js: The Node.js and React Native IDE for iPhone and ... by martin-adams on Friday February 22, 2019 @09:08AM (#19225393)
I finally found it. It's the "create an alternate desktop environment" part that I would say this falls under. Mostly because you have a desktop and they've created a new windowing environment that isn't native to iOS.

>> 2.5.8 Apps that create alternate desktop/home screen environments or simulate multi-app widget experiences will be rejected.

https://developer.apple.com/app-store/review/guidelines/

Re:Play.js: The Node.js and React Native IDE for iPhone and ... by egwynn on Friday February 22, 2019 @10:28AM (#19226101)
Got it. Yeah I see what you mean. This rule is more about them wanting to maintain control over distribution than it is about having a custom desktop / windowing metaphor. They don’t want people to create a platform within their platform where a third-party is distributing app-like things in an end-run around the iOS App Store.