New AFK/Leaver Trend: Leaving the match so enemy team can end = No leaver tag.
I've noticed this more and more recently. Especially true after a 4 kill or ace, a player leaves the match knowing the enemy team can end if we can't mount a full 5-man defense. Generally, the enemy team ends before the player will be leaver tagged, so there's literally no punishment for it.
I suggest implementing a system where if you're disconnected at the time that the match ends, you automatically get tagged by LeaverBuster.