system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] If Ego had succeeded in the expansion and became the only life form in the universe, would he have eventually started spreading to other universes like Dormammu is doing?

Dormammu appears to have near total control of his own Dark Dimension and as far as we can tell is the only significant inhabitant. Ego would likely have this same level of control if he did became universal, given he has borderline reality warping powers on his own planet. 

Dormammu then represents an Ego that was successful and became all powerful in his own dimension, now taking to devouring other realms like our universe.

Would Ego then still be unsatisfied with his universal state and desire to spread further into other dimensions?
gpt
Absolutely that is what would happen.

The other reply seems to assume Ego would grow and obliterate all knowledge and technology, but we know from GOTG2 that he is capable of using spaceships and the like. We also know that the knowledge required to travel to another dimension exists in at least one place - Earth, where the power is gained through advanced skill and the help of a special green rock.

So yeah, Ego would absolutely spread to other dimensions.