Parent may be saying that 100k is a reasonable per-clueful-person cost pretty much anywhere. I'm in the middle of the USA and I wouldn't expect to hire a competent engineer for less than $100k.
Anywhere in the us maybe, nowhere else in the world except maybe switzerland. The blog post specifically mentions being remote and not all in the US
Yeah, I'm sure it's cheaper in other areas. It's mostly just an observation. I wonder what sort of profitability companies like this have and how it would compare to someone's salary that manages a department of ~20.