If this is his aim to centralize Bitcoin mining and change the POW structure to something else, then it wouldn't be possible since in the end he only owns some few nodes while other miners scattered all over the world would continue mining Bitcoin honestly. He wouldn't be able to convince every other miner to join him, That is the beauty of decentralization.
Rich people always think they can change the world or a system of something. They think they can always just walk in and make changes but it takes a lot more than money to do something successfully. As others have said, bitcoin is so special that it’s hard to even take away the community it has been built on.