You can't build a business on AGI, which is an unbounded research project without any foreseeable end or path to revenue. However, LLMs definitely have some commercial value and OpenAI has a first-mover market advantage that they'd be insane to squander from a business perspective. I'm sure they will continue to do research in advancements of AI, but AGI is still science fiction.

Microsoft dumping $10 billion into them to commercialize LLM tech, primarily.

If anything, in my opinion, the more runway they have, the better chances to actually hit an inflexion point in AGI development. But maybe you're right.