RainbowKun isn't a scammer, so he shouldn't be tagged.
And what, on the forum tagged users only for a scam? For the fact that he sending merit between his accounts and used his alts to receive bonuses, in the form of merit, which helped the alts grow in ranks, this is already enough to mark all these accounts with negative trust, although not all of them are from the 60+ list.
Don't be a follower, be a leader. If you believe your evidence to be true, then tag the dude and move on.