> You missed the bit where they used the word "revenue".

No they didn't...

> I suspect if you factor in all the various overheads of running datacentres the actual value is lower.

That's literally exactly what the quoted part addresses: "Amortized cost of owning a DC full of GPUs is far less than $38/card/hr". Cost of running GPUs is far less than $38/hour, revenue is $38/hour, ??? , profit