This one's obvious. Though none of them have been tagged by DT yet.
Twinscoin2017 seems to be either having multiple alts that he has previously bought/farmed, that is sending him merits for posts that probably deserve absolutely none. In fact most of their posts are in spam megathreads with absolutely no content.
Plus, if you look at their post history... Looks very similar imo.
This could be potentially a case of an alt army, instead of just something simple than people abusing merit systems.