Lets say something first. "Exotic" picks/builds are fine as long as you try to win. About "exotic" strategies they are fine within certain parameters. As long as your team doesnt have a problem with your tactic its fine. As long as you dont actively give your team a disadvantage, intentional or not, its fine. But in here, you are giving your team a huge disadvantage that no one wants and they, apparently, didnt agree to. The disadvantage you are giving them is leaving a squishy ADC in a 1vs2 against a very oppressive lane. I wont say that it was right from your team to go afk. But its not right from your part to give that kind of disadvantage to your team without them agreeing.
And i can tel you something for sure. If you did this in a higher ranked game, you would have lost the game before 20 mins.