Basically, it spams every channel with verbal abuse using multiple identities with constantly changing keys, to the point of having vaguely non-sequitur "discussions" with itself. Pretty sure this is all the same guy. Currently he seems to be using variations of Gustavus a lot, but that changes too.

It was even using vanity keys for a while (npubs whose hex representation ends on 4 of the same digit), suggesting that whoever is doing this knows the protocol fairly well.