As others said, AI is not proper for this. Having interiors is strictly a human thing, and companies not wanting to invest in it. There should be lore, coherence with the exterior, items, assets. Many things AI is just not good at.

In the days of Fallout 3, there was a great mod that added interiors to many buildings in the game. It was a lot of effort, and very limited. And back then modding was a hobby, so not a lot of people made donations to keep it going.

At the very least, there should be a way to contribute to building interiors in games with official modding support.