So, question, is going AFK still bannable?

I've seen numerous players go AFK in my games, in my friend's games, and on streams. I have not once gotten, or seen, an instant feedback report in the last six months or so. I even sometimes get matched with those players again in the same goddamn day, where they usually proceed to recognize me, ban my champ, then troll the game unless someone dodges. High elo players are ragequitting left and right, and are somehow still playing weeks later. If AFKing is no longer a punishable offense, please let me know so I can save myself some time in these games.