Fortnite is about killing eachother, Roblox is about literally anything, Minecraft is about… well, mining and crafting, mostly.
But really, with mods, it can be just as ‘anything’ as Roblox, only with possibly less scrutiny.
Idk. I love Minecraft, for the record. It’s just the squeaky wheel gets the grease, and the popular online game that provides access to kids gets the creeps.