It’s installed on their PC. That’s 98% of it. If Linux was pre-installed on everyone’s PC we’d all be using Linux, and the normies would complain about how hard Windows is to use.
Even if there are Linux preinstalled laptops people don’t buy them. Linux on desktop has too many fundamental Issues and still isn’t a viable option imo. Even top Linux distributions don’t have particularly good interfaces with very questionable design choices.