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Re:Apple’s app store and other digital marketplaces [pdf] by sdflhasjd on Wednesday July 22, 2020 @05:39PM (#23921911)
I'm not sure what you mean by "not practical". It is definitely possible for macOS apps, and it seems to be possible for iOS apps too.

I have worked on an open source game, we cross compile for macOS on Linux without any Apple hardware.

As far as I understand - or have been told, this violates some Apple license terms.

Re:Apple’s app store and other digital marketplaces [pdf] by saagarjha on Wednesday July 22, 2020 @06:44PM (#23922378)
Surely building a binary that links against their SDK, as long as your are not using their toolchain, must be fine?
Re:Apple’s app store and other digital marketplaces [pdf] by dfabulich on Wednesday July 22, 2020 @07:42PM (#23922754)
It's possible, but it's cheaper and easier to just use a Mac, and the resulting builds will typically work better.

For example, does your open-source game notarize your macOS builds? It's easy in Xcode, PITA on Linux, and if you don't, your game is difficult to launch on macOS 10.15 Catalina.