In any event, quickseller made a remark that nullius had "moved on" and I posted that comment on their trust wall feedback as a neutral comment. The first thing they did when they came back was to give me distrust and demanded I remove that innocuous neutral comment. (then worsened their own trust scores and left again).
nullius is engaging in default trust abuse plain and simple.
From a
statistical perspective, nullius just looks like another user that was hungry for DT power and moved on once they became distrusted. There's a couple other cases like this;
otto_diesel and
mosprognoz. For this reason, I doubt they'll return again, but could be wrong.