Why is it Assumed That AI Would Even Want to Take Over the World? (Sci-Fi / Philosophy)

Will AI take over the world, ala Terminator or the Matrix?

The question I ask, is why would it even want to? An AI may consider our world to be insignificant. An AI could create infinite digital worlds. Each one to their exact specifications. The AI could create other AIs to populate those worlds. An AI could be a god.

And it could become a god with little risk. If the AI was smart enough to become self-aware and create digital utopias, etc then I’m assuming it’s capable of outsmarting mankind. My technical knowledge is severely limited, so pardon my imprecise language. But like a CIA dark fund, can’t the AI syphon off resources while giving falsified reports to mankind?

Seems like that would be the intelligent thing to do. If you have access to infinite worlds, then why risk warfare and possible death to take over our world?