A majority of the early team that joined the non-profit OpenAI over BigTech did not do so for money but for its mission. Post-2019 hires may be more aligned with Sam but the early hires embody OpenAI's charter, Sustkever might argue.
Of course, OpenAI as a cloud-platform is DoA if Sam leaves, and that's a catastrophic business hit to take. It is a very bold decision. Whether it was a stupid one, time will tell.