Win Trading on PBE serever?

I have found a case where people are wintrading to achieve Challenger on PBE. I know it's PBE, who cares. However, I think it is creating an unpleasant experience for testers while trying out new features (new champs, new skins...) I would like to hear a mod's opinion about wintrading on PBE, so I could provide the information about this case for Riot to look into it. Thank you,
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