> OpenAI was desperate to dump Microsoft

Yes. Microsoft was "considering legal action against its partner OpenAI and Amazon over a $50 billion deal that could violate its exclusive cloud agreement with the ChatGPT maker" [1].

[1] https://www.reuters.com/technology/microsoft-weighs-legal-ac...

I linked this in another comment but Azure has problems and OpenAI is tired of waiting.

https://news.ycombinator.com/item?id=47616242