This is a major problem, every game i have had regardless of role or hero has had some kind of:
Leaver, thrower, feeder, troll etc.
This problem is VERY prominent for supports because they can’t do the things that other roles do to progress through the match. (make space etc)
Another thing to point out is the language barrier in EU which is just as good as no comms at all because sometimes you need to say more than a heroes name.