Do OpenAI employees actually get equity in the company (e.g. options or RSUs)? I was under the impression that the company awards "profit units" of some kind, and that many employees aren't sure how they work.
No, "since 2015" is by definition not "a long history".
For a long history, try the principality of San Marino, or (if you want a company) Stora Kopparbergs Bergslags AB. Or one of the Japanese temple-builder family companies. 2015 "a long history" -- wasn't that when I last took a dump?
Why aren't they simply asking their product?