The meaning of "Operating System" is actually very contextual and personal:
- agerage person - bootloader into Netflix and PornHub
- gamer - bootloader into ring 0 anticheat system which probably knows your current heartrate right now
- corporation - bootloader into while loop of slack and excel and chrome
- The corporation's IT guy - "whatever I feel like dealing with and have spyware for"
- government - surveillance, control and manipulation vector
- linux user - really pretty bootloader into PornHub