Yup. Except I do it with GNU+Linux —sometimes I shrink the original OS partition and keep it there until the warranty runs out (you never know).
A few years ago, though, they were discussing a norm (at least in the EU) for which you could walk up to someone selling you a computer and tell them to keep their pre installed OS and don’t charge the license price, walk away with just the hardware.
Did that happen? Wouldn’t it be awesome if it did?