win trade

i playd a ranked today as hiemer. and we got a jax jng who is wintradeing with the others. how can these ppl do this and how dose this work is it even against the rules ? cus ppl talking about this win trade like its the new rank up method i just wanna know wtf cus he lost us the match on purpse and said he win traded. and if i wanted it or the others on my team just text him on leauge.
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