Indeed, I'm using several open source libraries in the engine and I am not afraid they would die. Because even if they did, I would just continue changing them

Indeed, I'm using several open source libraries in the engine and I am not afraid they would die. Because even if they did, I would just continue changing them on my own. I think it's less risky than using e.g. CryEngine, since recently there is a high chance Crytek going bankrupt and there is no way single person can handle something as big and complicated as CryEngine.