Zed only player goes AFK when he dies first in lane/jungler and he is still not banned.

Recently i play against a Zed only player, and he was jungler, and he just locks Zed jungler, then i decide to go and see if he only plays zed.Then i saw he normally goes AFK if he dies first in the lane/jungler. He is doing since atleast the beggining of the year and he is still not banned. Is the system working correctly?Why is this player not banned yet? http://prntscr.com/bw7j0x http://prntscr.com/bw7jg0
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