The $70b estimate was based on a comparison to Anthropic, which includes revenue from cloud providers. OpenAI does not include this in their numbers.
So, the number did not come from OpenAI. It was an accounting mistake made by some investors and media, who did not adjust for this before reporting on it. I see fintwit calling on FT/Axios to issue a retraction; good luck with that.
It sure is interesting to see the rush to judgement in this thread. Another poster correctly pointed out this mistake (now buried under the sea of misinformed posts trending above it.) The Internet is cooked.