It seems that their data is mostly coming from their own user base (the discord data is biased as they admitted), which is mostly comprised of programmers and other techies. I don't know how far this generalizes to the rest of society.
I personally like dark mode during night time, but almost always prefer light mode by default. There's just something about dark mode that is... gloomy and depressing. It feels like an overcast day, whereas light mode feels like a bright sunny day. I've noticed that most techies do prefer dark mode, and I also recall reading that techies are disproportionately night owls - I wonder if there's a correlation there. I suspect though that this preference is reversed for the general population.
I personally like dark mode during night time, but almost always prefer light mode by default. There's just something about dark mode that is... gloomy and depressing. It feels like an overcast day, whereas light mode feels like a bright sunny day. I've noticed that most techies do prefer dark mode, and I also recall reading that techies are disproportionately night owls - I wonder if there's a correlation there. I suspect though that this preference is reversed for the general population.