Let's say your client crashes and you cannot get into the match for, say, four first minutes. You reconnect into the match, your team did not remake. You end up almost coming back, you had good time playing with your team.
The game ends and you get rewarded with nothing. You are labeled as a 'leaver', like those who ragequit 6 minutes into the game and those who decide to start a match even though they have a dentist's appointment in 10 minutes.
Why is this still a thing? Like, why would you bother coming back if you don't get rewarded regardless? I know this might sound unsportsmanlike, but you put yourself into a position where you start your lane at a disadvantage and won't get rewarded for doing so. Why would anyone want to do that?