Sure, so StarCitizen (the game) used Cryengine at first but Crytek (the company behind Cryengine) was not doing well, and some talents left it. In the meantime Amazon took Cryengine over and renamed it to Lumberyard (now Open 3D Engine). StarCitizen then turned to Lumberyard because..well the because the state of Crytek, and Crytek sued SC, it a bit more complicated why CT sued SC sure, but no one want to work with Crytek nowadays because of that.