Bots in 3v3 Ranked games

i just started playing 3v3 ranked, i have lost 5-6 games becuase of bots, not trolls bots, like only buy 2 d blades then afk farm in the middle of lane take damage dont move then last second walk away allready dead, how is that allowed, a multi billion dollar company cant stop robots for playing....its just dumb if 3v3 is ever gunna get more popular you need to fix it