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You have provided next to nothing to explain what you are talking about.
At that, anything linked in chat that is suspicious is probably just that. Anyone with the right code can link something in chat even if it does not exist in game.
You can modify the linked items, so it looks like there are for example not bound vMA weapons or vMA weapons below 160 etc. That's what he is probably talking about.
Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity. But the dreamers of the day are dangerous men for they may act their dream with open eyes, to make it possible.
I think you could get banned for that. I heard. Until I hear otherwise, I'll assume so.
Where did you hear this from? sounds like whoever told you was being super super paranoid.
It's literally just text, If they wouldn't punish people for exploiting dupe glitches in the past, i highly doubt they are going to have a crack down on the 1 or 2 people who use codes to link an item in chat.