I lost a couple of matches in ranked and thought If I continue would I still lose, thought to experiment. I don't know what the reason is but you will be matched with griefers, feeders, throwers, and disconnects every game without a doubt. I don't have evidence but it's what happened to me.
No matter how well you play, you are bound to lose a few matches and you can never control it. It's not about forced 50, just the game punishing you with these stupid players in your team.
I am just clarifying I am not complaining, for those people who are ready to tell git gud, this is not for you.
I will give you an example of my game, I am on a losing streak and the next game I played as Enigma and all is going well, and our Carry Slark suddenly for no reason just goes all in and throws the match. Hopeless situation, hope people learn that never ever queue for another ranked game after you lose a couple of matches. Above all , you will be happy that you did.
6202139887, this is the match id of enigma gameplay.
Source: https://www.reddit.com/r/DotA2/comments/pyh1oq/tip_if_you_lost_a_couple_of_matches_leave_ranked/