When a multi-account player has collected enough chips in a tournament, they start to play decently, they do not play the whole bingo-style tournament
I have to admit that today I observed pretty weird behavior from one of the players in PS High School League tournament which is consistent with your description. That player was dormant ("sitting out") for 5
hands, then he awoke and went all-in preflop with
calling all-ins from 3(!) players before him - well, he flopped 2 pairs and won the pot. After that he played normally. In favor of your theory also speaks the nickname of that player - "sexy girl422".
But on the hand i don't see that as a problem for "law-abiding" players because in most cases such all-ins are easy money for them.
P.S. I have no idea how that smile got at the top of my message and how to delete it.