Is the "open lane" behavior bannable ?

This seems to fall into the griefing/giving up report category. Even as an enemy, I'd still report that if it occurred in my lane.

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Because it should

Yeah it sort of is, but if everybody agreed can't really do much. Plus, what are you going to do, ban everybody who gets demoralized in a game?

It is.

It is if the team doesn't agree to it. Think of it as an early surrender vote if 4 people agree to it then you should probably just move on to the next game if not feel free to throw a report.

i think its fine if all FIVE players agree, but if that one player still wants to play i think they should be allowed to instead of having a open mid.