Satan was cast out because he was rebelling against the order. He wanted to become god, and God had no choice but to provide, for Satan asked and he shall receive. So God made him a god by casting him out. Satan is going through a universe of punishment, but it’s necessary pain so that Satan can truly say he is become a God after all that he has experienced.
If we rebel and truly devote our power to our ascent, to become a god, we have to be ready to go through hell.