This is going to be fascinating to watch. You have to think all of the usual players are going to offer everyone at OpenAI crazy salaries to break from Microsoft, if for nothing else to disrupt them from taking over OpenAI for free and to sow chaos and "deal doubt" amongst the remaining. It is what I would do if I were Facebook or Google at least.
Meanwhile, at Microsoft, they had no raises this year because of "economic situations" or some such BS. So watching a bunch of folks get 2x raises doesn't sound like it is going to go down well. Not hard to imagine a lot of discontent with this from that angle as well.