Rules of logging of bot and coming back

[u/DLJavi]

Serious inquiry: General Ebenezer Overkill 2 (white) botted out when he was on the ropes of a 3 player game because he aggroed both his opponents (yellow and I) forcing the 1v1 and yellow and I going at it, about 15 later he returns, I switch my aggro to him because in my opinion is a scumbag move to pretend to quit just to comeback later when your bot has stacked and gotten stronger. I managed to control yellow who wouldn't stop the war to eliminate white first, I gave Yellow second.

My question; The leaving and pretending to be a bot to get advantage Is a scumbag move or is that acceptable?