What is with these leavers?

A lot of people leaves instantly at the start of game, or let you kill all their building salty people in bronze league LOL !!!

maybe they dont like that matchup?

You wait 100-300 second and than they inst aleave…

Or they are like me just wanting to get the portraits for this season and so they do nothing and want the other to just let them do their thing or they leave ASAP so the person do not waste their time. In anyway they are sure they can not even win so they do not try.
If you want to read more about this, there where great discussions about this themes in this threads: