This is why you should take care when signing a stock option contract... https://www.vox.com/future-perfect/351132/openai-vested-equity-nda-sam-altman-documents-employees
That's sucks...
Leaked OpenAI documents reveal aggressive tactics toward former employees

Has Sam Altman told the truth about OpenAI’s NDA scandal? How the OpenAI CEO and other key players treated the question of vested equity, explained.

Vox