Intentional feeders don't get banned
Unless it's so obvious that Riot's automatic system catches it, and you really have to be doing nothing but running it down mid nonstop and spamming 'I'M INTING LOLOLOLOL' in chat. I get it, there's really really bad players out there that have really really bad games, and Riot doesn't want those players banned, but when my 1/19 Vayne is just pushing bot until the enemy team comes to kill him and brags about his feeding in chat doesn't get banned, that's a problem. If 1/19/1 with 3.2 CS doesn't get banned (his only kill came when we were about to lose anyways and he just condemned a low health target onto our nexus), that's bad. I checked his history and looks like he probably did it the next game too.
I'm posting this here because support actually read these, unlike reports, so hopefully it shames Riot enough to the point where they will check and deliver action, because otherwise, if autoban doesn't catch it, it goes on with impunity, and I'm tired of it.