> Or is this some weird publicity stunt? (But then why is nobody walking forward to take credit?)

Indeed, that's a good question. What motivations might someone have to keep this running?

Maybe they don't even know.

I mean, they have it publishing blog posts about its actions -- one would think they'd read its own blog at the very least? (Unless.. scary thought.. this person unleashed so many bots that they're not even bothering to look)