Game consoles.
Godot can't include game console-specific code because its open-source license is incompatible with the various game console API licenses. But that doesn't mean you can't have have your Godot game on a console.
I supposed there could be some way the core team could setup a different group targeting closed source SDKs (even maybe for a fee... as a way to finance the main open source development?). For instance monogame is open source and supports most popular game consoles [2].
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0: https://lonewolftechnology.com/
1: https://docs.godotengine.org/en/3.0/tutorials/platform/conso...