To prevent players like this there must be a big punishment and some minimum win rate requirement for recent games.
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if a player pulls this sort of trolling with extremely low performance, make player reports more sensitive. even two reports should instantly result in player to get banned.
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in recent games (for example 10 games), win rate must be above some value (for example 30%, game mode and hero played does not matter), if player does not meet minimum win rate requirement, he can not play SL any more and must win some Quick Match or ARAM to improve his winrates and be able to play SL again.
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if a player performs extremely poor in SL compared to his average performance in other games, there must be a punishment such as blocking SL for few hours.
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if a player leaves a match due to AFK, it must be given only two chances to rejoin the game.
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if a player repeats this trolling behavior more than 3 times in short period of time, ban his account permanently.
https://imgur.com/L7GUqHM
https://imgur.com/R02KFXf
https://imgur.com/cqqlqmI
https://imgur.com/q5QKNnd
lets see how this community is helpful and pushes devs to do something about this or should I just quit because of bad community who does not care at all.