Maybe the agreement is "we will accelerate vesting of your unvested equity if you sign this new agreement"? If that's the case then it doesn't sound nearly so coercive to me.
> They don't share the equivalent of a Cap Table with employees, so there's no way to tell what sort of ownership interest a PPU represents
It is known - it represents 0 ownership share. They do not want to sell any ownership because their deal with MS gives MS 49% ownership and they don't want MS to be able to buy up additional stake and control the company.
> And of course, it's unlikely OpenAI will ever turn a profit (which if they did would be capped anyway). So this is all just play money anyway.
Putting aside your unreasonable confidence that OAI will never be profitable, the PPUs are tender offered so they can be sold to institutional investors up to a very high limit, OAIs current tender offer round values them at ~$80b iirc