@LoyceV,: has already told you.
OP, Start doing something that you think violates the rules, it's better, than other people have to do something they don't know yet.
Marking an account is not an objective of DT, if the account does not violate forum rules or cheats, it needs something very valid proof for DT to start marking it.
Having an Alt account does not violate existing rules, while an Alt account does not commit fraud, etc.
Most probably alt of
ViteLabs, might have bought to bump their ANN.
They bumped ViteX ANN
here and
here and VITE
here.
I checked a few posts from participants who commented on their ANN, but did not point out any danger or lead to fraud.
The conclusion:
If you feel wronged by them you can mark it or you can make a flag to declare them deceiving you, provided that sufficient evidence is included.
Maybe, DT can consider the best they do.