"The $70b estimate was based on a comparison to Anthropic" -- Can you prove that? All I could find were major outlets (Reuters, Yahoo Finance) citing an Axios report, that itself cited "sources familiar with the financials tell Axios.". I haven't found anything similar to what you are claiming.
Well, Axios are now reporting this themselves: https://www.axios.com/2026/10/08/openai-50-billion-arr-anthr...
Also bear in mind that the original $70b number came from an 'anonymous' source to Axios.