> OpenAI is worth many multiples of that.

How?

Because they recently issued shares at a price many multiples of that, and people bought them. How else would you define financial worth?

I would use your number adjusted by some demand elasticity curve.

	▲	tanseydavid 28 minutes ago \| parent [-]
		The "back-of-the-napkin" only has enough room to estimate based on recently issued share price. Seems reasonable to me.