Then I switched jobs, they gave me a new MacBook that doesn't run Linux so I use osx.
Ten years ago I cared about privacy, now I feel like that ship has sailed. My own privacy is not that important. The privacy of my fellow citizens is gone. I mourn it kind of, but you can't close Pandora's box.
Another category is people who installed it themselves because they like it better, but for non-ideological reasons. Like, a large chunk of programmers feel much more comfortable on Linux than Windows.
(I’m not sure what to make of your point about dual booting — it’s hard to believe anyone would “not care” about having to do a full reboot every time they wanted to do something as common as view an office document. Now “let me finish reading that interview candidate’s resume” goes from something I can alt-tab to while compiling into an ordeal of saving all my open work, rebooting, downloading and opening and reading it, rebooting again, reopening all my work...)
People that go through the trouble of installing Linux on a Desktop Machine, where Windows or MacOS was probably pre-installed, will either dual boot or use Linux exclusively. If they dual-boot, they will probably just use Office on the non-Linux System and not care.
But if they use Linux exclusively they will very probably care about the freedom and control Linux brings.