The strongest claim is that the original agreement was positioning SC as a showcase ad vehicle for cryengine, but, with CIG moving to the lumberyard fork, this is clearly not happening. Basically SC was married to cryengine until death do us apart, but now crytek is lying sick in deathbed and CIG have run off with their sister (because, despite all metaphors, CIG are still a company, not a spouse) instead of sitting at their bedside, holding hands as long as it takes.