Linux is great and all that and I am comfortable installing and using it but there's no civil rights to be offered a PC with no O.S. or indeed any particular piece of consumer electronics you might desire.
Sony et.al, are perfectly within their right to make a commercial decision on what configurations and O.S. they put in their PCs and laptops.
If you don't like it, don't buy it. And if you can't get what you want, tough. It's a commercial decision, not a fundamental right.