Common advice is to value earlier stage equity at zero anyway, so how the heck are people credibly calling that worth 600k...
OpenAI will probably end up like UberATG where Microsoft bails out a handful of $10m-plus equity packages, some engineers transfer into MS and get partial recognition, and a bunch of engineers get laid off or sent to a competitor for basically zero. Good chance of this happening when sama has to scale up aggressively and flops.