Worth noting that Steam doesn’t track playtime for non-Steam games. So this doesn’t include Minecraft, Retroarch, or anything purchased through Itch, GOG, or Epic.

Do you think any of such games would be in the list?

I’d imagine only a smaller subset of people even set up their Steam Deck for third party games.

I dunno, I feel like the Steam Deck’s core audience is “people who liked the Switch’s form factor but also like mods and third-party launchers.”