To be clear, in this context, I'm only talking about delete bots who kill new content seconds after it's created. A phenomenon so frustrating and common that there are probably tens of thousands of examples on open forums of this (including HN) and no doubt is a huge part of the massive reduction in new editors and new user engagement at WP (as tracked in several Foundation reports over the years -- but somehow always ignore this issue).
There aren't any bots that auto-delete articles. There are a handful of bots with administrator privileges, but they can only do things that humans have specified, with significant delay. For example, there was one (no longer active) that deleted empty categories that had been flagged by a human for deletion as empty, and not challenged for N days. There was also one (haven't followed up on whether it's still active) that deleted images that were tagged as copyright violations for more than N days.
