Wrote an SCP that was downvoted and deleted a couple of weeks ago. Someone noticed yesterday that this user has, apparently, downvoted…everything. As in, user is believed to have recorded a downvote on every single published SCP, with the exception of 20 SCPs in the 1500s range. I've asked Anqxyr to do a statspull to confirm, but if so, this is…literally the definition of malicious downvoting. We might PM them, since they're relatively old hat, but I can't see how this wouldn't be met with a permaban.
Will update with more information as the situation develops.