Also keep in mind that Microsoft hasn't actually given OpenAI $13 Billion because much of that is in the form of Azure credits.
So this could end up being the cheapest acquisition for Microsoft: They get a $90 Billion company for peanuts.
[1] https://stratechery.com/2023/openais-misalignment-and-micros...
To be clear, these don't go away. They remain an asset of OpenAI's, and could help them continue their research for a few years.
Personally I've got enough IOU's alive that I may be rich one day. But if someone gave me retirement in 4 years money, guaranteed, I wouldn't even blink before taking it.
*I think before MS stepped in here I would have agreed w/ you though -- unlikely anyone is jumping ship without an immediate strong guarantee.