Virtual Reality systems need to support Linux because they need to be built around Free Software: https://www.gnu.org/philosophy/free-software-even-more-impor...

It is essential that we as computer programmers work towards making virtual reality systems respect people's freedom.

This is a problem of basic ethics and morality. You can say "I don't care" all you want and buy into the proprietary systems, that just means you are literally paying money to build out the surveillance police state infrastructure.