Deadlock is still early in development, so some players have been able to play however they like without any kind of punishment – but the newest update should stop that.
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However, when it comes to things like players just abandoning matches for no good reason, there wasn’t a system that disincentivized such behaviour.
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One thing Valve still needs to work on is its cheating issue, but again it’s early days, so presumably this will come in time.
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As part of the game’s September update, this has now been changed, with some punishments coming into effect in certain instances.