> Turns out people don't want a "virtual world", they want a fun game.
Arguably, there are people who want a "virtual world" -- and they currently just play Roblox to get it. Enough of them like it, that every major retailer stocks "Robux" gift cards
Steam has a ton of social features too, and that helps keep it popular. Is it a "virtual world"? I don't think anyone would define it that way.
The primary thing you do in Roblox is pick a game you want to play, which is largely isolated from the other games. Plenty of people will never touch the social features.