I don't think that AM is an issue.

There are cleanup methods in place. The only thing that reasonably could need to be added to them is a rate-cap to how fast AM can post. Nothing to stringent, just a limit so that the volunteer-driven cleanup won't get overwhelmed with an automated script.

Indeed a far bigger problem is the fact that there is reason to believe some anti-social moron has a collection of vote bots that are methodically downvoting various people. I don't see any good way to tell who, but I suspect a collection because the sheer number of votes that are apparently thrown around in a coordinated manner should be beyond the limits of any single saint...