They used to have agreements to make it difficult to do so. I don’t know if that’s still the case but it’s pretty awful. I think OEMs had to pay licenses for every machine shipped regardless if it had a windows license.

The other issue is that oems have a large amount of compatibility and support built up over the years for windows. They also know their customers can deal with Microsoft for “support” and ignore driver and support costs for whatever distro of Linux they were to choose.

Sure an OEM could lead the way and show everyone else the path to freedom but think of the shareholders