The Altair analogy doesn't work at all.

That was created by a scrappy little company (<20 employees) on basically no budget and even then

"The Altair 8800 computer was a break-even sale for MITS"

It sold like hotcakes (maybe because at break-even it was a damn good value to hobbyists compared to DYI at the time, unlike 21 trying to sell $100 worth of DYI hardware for $400) forcing the company to massively expand just to deliver the orders. We'll see if that happens here. You know my guess (it won't). I doubt you are going to guess otherwise, but go ahead and make a prediction if you like.

If you read the actual history there is literally no similarity at all: https://en.wikipedia.org/wiki/Altair_8800

The real target cost for the 21 chip is pennies, not dollars, not hundreds of dollars, certainly not $400.

Drop the chip, embed the design in SoC’s and we’re talking fractions of a penny.