I can also tell you why if you or anyone else cares: It’s because this is the only PbtA I’ve ever run into where the GM uses (some of) the common moves. Unique, as far as I know, until Undying came out.

NPCs don’t have Hx with the PCs in Apocalypse World, for example. But they do hold debts in Urban Shadows and I believe the rules are samesies for PCs and NPCs in that case, but also explicitly called out.

Eh, I’m a pretty close reader but sometimes I trip over things. It happens.