It is also unclear to me how much real debt they carry. They have famously been signing many deals: RAM, datacenters, maybe nuclear power plants -I no longer know what is a joke or not. They must be carrying hundreds of billions in paper debt obligations, which is tough to payback at $20B revenue.
When they put 10B in, they got weird tiered revenue shares and other rights. That has been simplified to 27% of OpenAI today. I don't know what that meant their 10B would be worth before dilution in later rounds.