Let’s get some facts straight first. There’s no editor source code of CryEgine provided, so it’s not “full” source code, only “engine” part (and missing modules like monobridge). And once you build the engine yourself, you lost scaleform integration.
It’s not the engine I have problem, it’s the attitude of CryTek I can’t help but having doubt. Reading the CryEngine EULA (weirdly can’t be found anywhere except in their launcher):
[]
Crytek may modify this Agreement at any time…If you do not agree with the new terms your only remedy is to stop using CryEngine.
[/]
And comparing that to the EULA of UE4.