I follow npubs that aren't "real" people, but I find them valuable for other reasons. Not every npub included within what npub.world considers "reputable" is a real person, I am sure.

I can also tell you from running a WoT relay that there are still a fair amount of bots that make it into my WoT because people who I follow, and would therefore be considered "reputable" are also following bots, which would in turn make those bots "reputable" since it only requires one "reputable" follower for an npub to also be considered "reputable."