Too many leveling bots

I saw a post on boards about bots playing in lower level games. like Co-Op and some even in normals. I thought it was a fluke that some people encountered them by chance. But I need to agree since I just encountered two of them in one game. It may be the same person that made these two accounts or not? who knows.... These two were both at midlane the whole time. Idling for like 5 mins there and then just started moving not using skills and just basic attacking champs/minions. So yeah I think there must be some kinda system to prevent this.
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