The past five games i have had one or more teammate afk the whole game, at worse 3. Is there a reason why people are willing to throw games at the start of an act? Plat diamond lobbies btw

Just finished a game with a Jett throwing our game. Didn't buy, grabbed spike and went afk nearly every round. Like why, what's the point? I keep getting these kinds of players or smurfs. Kinda frustrating.