I have a bit of a story about how lax Riot is about afkers
A friend of mine I was playing with for a bit had a really shit computer and his game would freeze on the loading screen almost every game, we got into a few but during this time at LEAST 15 games were afked by him in the span of a few days, again not his fault his game was actually freezing up.
For at least 15 games almost in a row you know what he got? low priority queue. Which was nice for him since it wasn't his fault, but for people intentionally afking to ruin games all they'll have to do is sit in queue for a few minutes and theyre right back in to afk again.
We did find a fix to stop his computer from freezing though, we went into a custom game where he was actually able to load in and I had him set all graphical settings to the bare minimum and that fixed it, if anyone else is having the same issue.