There was a brief moment in the 2000s where major manufacturers were selling computers with Linux preinstalled. A lot of netbooks and thin clients had Ubuntu as an option.
Simply having the option is a good start, but a lot of people would buy those and ask "a friend" to install windows instead. I've seen that happen quite often in the early 2010s
Dell's Linux support is laughable. I have the distinct displeasure of dealing with their shit quality right now. Camera doesn't work, fans spin up for no reason, graphics card stutters / sometimes there's no hardware acceleration... Actual linux shops like system76, purism, tuxedocomputers, slimbook, and other better hardware, better pricing, and better hardware support.
Dell, Fujitsu, HP, etc. are OK as Linux hardware providers, but it's clear that their main business is till WIndows.