Time will tell about openai's true import. Right now, the jury is very much out. Even in the llm space, it is not clear that openai will be the ultimate victor. Especially if they keep hemorrhaging talent.
But RIGHT NOW they are in a very strong position in the world's hottest industry. Any of us would love to work there! It therefore seems reasonable that no one would voluntarily quit. (Unless they're on their deathbed, I suppose.)