And we've now reached the point that PCs come with Windows for the same reason you can't find a non-"smart" TV anymore. It comes preloaded with spyware, which has a market value to the seller, which makes that device cost less than one with only free software on it.
Sophisticated buyers then take the discount and wipe what it came with, which contributes to alternatives not being widely available, but unsophisticated buyers don't know how to do that and get stuck with the spyware.