I do, because some of the first games I played were my dad’s flight sims. I got used to the “down = up” idea, so it was natural to invert the Y axis when I started playing FPSs. My brother also does because he just used whatever options I had set for the game. But outside of my family, I can’t remember specifically noticing anyone else who inverts the Y axis. Whenever I take over a controller or keyboard/mouse from someone it seems like 100% of the time I have to immediately change the settings.
So I’m curious what the ratio is. From my experience (and the fact that it’s the default setting) I’m fairly sure non-inverters are the majority, but by how much?