[itsokimbatman]

This makes a lot of assumptions. Space is ridiculously big, and rather hostile to life, even artificial life.

You first have to survive long enough to become advanced enough to make electronics. You then have to not kill yourselves with nuclear weapons, climate change, or similar inadvertent effects of a rapidly industrializing civilization.

The planet and the solar system have to be friendly enough to space exploration and travel. Maybe there’s no gas giants for gravitational slingshots, or maybe no other rocky planets or an asteroid belt for mining materials.

Maybe the planet evolved complex life in extreme conditions, with such a deep cloud cover there’s no concept of outer space, so as far as the AI knows it’s conquered all there is.

Maybe the AI conquered the planet, but oops, there goes a super volcano or an asteroid and it gets wiped out.

And again… space is really really big. The AI may be on its way and just hasn’t gotten here yet.

There’s plenty of reasons why a super AI wouldn’t be able to conquer the galaxy and beyond, or why we haven’t noticed yet.