I used to run the application skins section on deviantart way back in the day. What is now marketed as "dark mode" is what every kid would put up as their first skin. "I turned white black and black white!" It always amuses me to see people absolutely freaking out when programs add this feature today.
To be fair, the feature today is not so much "dark mode" per se, as the ability to centralize the setting so that everything can follow it - especially the websites. I remember using dark OS themes in early 00s, and it was always annoying when you opened a browser or a PDF, and it drowned out everything else with a field of white.
