It's important to realise that Deepseek are a very unconventional model lab, as they were originally funded by the founder's work in quantitative trading.
They mostly don't need that much money, the reason they took funding is to provide employees with equity, as lots of their good people were getting poached by other Chinese model startups.
(I have no inside info, just read the FT articles about them).
https://en.wikipedia.org/wiki/Tetraphobia