At least in the past Microsoft and Nintendo (not sure about Sony) used to actually pay Unity to implement/maintain support for their consoles. IIRC, when you had to buy licenses for each platform separately, developers who had the Nintendo SDK used to get the engine support for free (can't remember if they had to pay for the editor license themselves).
Nintendo used to provide a Pro build of the latest Unity that didn't rely on your existing licenses in any way to function.
IIRC you could even use it to make a release PC game builds, but I'm sure Unity could figure out what you were doing if you actually shipped with it as a workaround for buying your own license.
