As far as I can tell, all three of them are of Polish descent. For all we know they might have decided to resign together even if only one of them had a personal issue with OpenAI's vision. We will find out soon enough whether they will just found their own competing startup, based on OpenAI's "secret sauce" or not.
Nothing to do with being Polish in particular. Only that there is a connecting element that might help explain why these 3 decided to resign together on the same day.