After Deus became the host of the Tap Idle Tycoon System and obtained power, contrary to those in that situation, Deus didn't become arrogant and prideful.
In fact, he became much humbler than before. Especially when he learned about the identity of his girlfriend. Not to mention, meeting warriors and aliens who invaded planet earth.
Deus became humbler because his horizon became broader than before. He came to realize just how insignificant his existence was.
After all, the creator of his system wasn't even the strongest. So the chances of Deus becoming stronger than the creator of the system were indeed there, but so what?
It doesn't mean that others can do it, he could as well.
The saying that: others could do it, you can as well, was a complete lie.