Quoting from the link: "..., but you can't go to BestBuy and buy Linux with a specific distro on it that everyone uses that has widespread market share"
I thought you could buy linux PCs off the shelf in one of big American chains (walmart???). Was a low powered eco thingy iirc.
Also as far as I know you can buy linux on laptops from Dell as well.
Every nonzero finite dimensional inner product space has an orthonormal basis. It makes sense, when you don't think about it.