Rumors. The Information had a story about this (but it's behind a paywall): https://www.theinformation.com/articles/openais-annualized-r... - their story was based on "people with knowledge of the situation" aka insider leaks.

I don't know the source for https://www.notoriousplg.ai/p/notorious-openais-revenue-brea... but it could just be that same Information article.