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.
The details here certainly matter. I think a lot of people are assuming that Microsoft will just rain cash on anyone automatically sight unseen because they were hired by OpenAI. That may indeed be the case but it remains to be seen.