We hope that 10 year exercise windows will become the industry standard so that no one needs to worry about this anymore. Unfortunately, that hasn't happened yet. In the meantime, you can see a list of companies that have committed to them here: https://github.com/holman/extended-exercise-windows.
Fortunately, the fix is very simple: companies should just offer 10 year exercise windows. That prevents this scenario from happening to employees. We've written about this a bunch of times: https://dangelo.quora.com/10-Year-Exercise-Periods-Make-Sens... https://blog.samaltman.com/employee-equity https://triplebyte.com/blog/fixing-the-inequity-of-startup-e...
We hope that 10 year exercise windows will become the industry standard so that no one needs to worry about this anymore. Unfortunately, that hasn't happened yet. In the meantime, you can see a list of companies that have committed to them here: https://github.com/holman/extended-exercise-windows.