Although Dong Tianyu had the capability to establish a power, he didn't want to directly create one due to the trouble it would entail. After all, once a power is established, to earnestly maintain and develop it would inevitably lead to actions that go against one's own conscience in the face of certain situations.
Then again, if other people established powers, it would be to collect special items that are hard to acquire through trade, but for Dong Tianyu, who could already be self-sufficient relying on the Cave, there wasn't really anything he couldn't obtain from the outside world.
After all, the ingredients containing Spirit Energy produced in the Cave at this time were top-tier resources of Heavenly Materials and Earthly Treasures in the outside world. Basically, if Dong Tianyu offered these crops, almost no one would refuse to trade with him.