He’d move on to the next planet / mother, repeat, leave another kid wanting to see their real dad & carrying enough daddy issues through their life to allow him to win them over.
Eventually, when they were old enough, Yondu would collect them & bring them to him for the next phase in the process.
Ego roamed about the universe, “grafting his DNA” with as many willing mothers as he could, with the look and swagger of a young Kurt Russell helping him achieve his ultimate goal.
That goal being to create a child with enough Celestial DNA to develop a connection with “The Light” at the center of Ego’s planet, in order to further his ultimate plan of re-writing the universe.