On one hand, those worlds without much value had already been revealed to Gu Jinlai.
Moreover, they might use these worlds to distract Gu Jinlai, so he wouldn't always focus on their Spirit Realm.
Just like the creator from millennia ago...
If they hadn't secretly spread the "Spirit Master" path, allowing those creators to tap into the true power of the Evil God, thus causing backlash, the Demon Realm might have indeed become a hunting ground for those creators.
Furthermore...
They selectively revealed some worlds of low value, keeping the truly valuable ones hidden; how would anyone know?
At present, Demon Lord Cangming said, "I will sort through the coordinates of those worlds and hand them over to you along with the Evil God's materials."
"Alright."
Gu Jinlai nodded.
No contract was established between the two parties.
Without trust, a contract holds no meaning.