Hey Riot what is going on with the AFK guys...?

Riot why do you always match me with "players" who are dropping out of the game after 5 mins? Like I get it, you want us to train in playing 4v5 or improving our solo skills... but it is getting kind of annoying. 7/10 games I get afk guy. Can you like get some sort of "afk shield" so when u have ping above 100 you cant start the game? Why do you let players who instantly drop of the game play the game?