(YCor 2019/July/12) A last fact, of one higher level in misbehavior (if confirmed), is the use of an username that is a seemingly real name (Denis Chaperon de Lauzières), which has been a real user of MO (real accounts here and here). Two suspicious posts under 1 user with this name were posted here and here (user now removed and both question deleted by community), and a comment-like answer here (same name, other account - now converted to a comment).
