Both team had 1 High Ranked player Per Team.
You were High Ranked in your team , Ratings affects Balance, Balance makes game Competative.
If your team rely on your Carry to win and you make a dagon since you think its a "Noob" game, it will be considered as sabotage.
This is not the 1st time you throw the game ,because you dont gain/lose PSR.
I gave u 24 Hour ban as a Mention that even if you dont care, we Care.