In theory, yes. In practice, no. Since maintenance mode I’m skeptical that they issue bans for any reports outside of abusive chat.
If they still issue bans for these offenses, the amount of reports needed to trigger anything is significantly higher than the amount of reports you could get from the amount of games you’d need to leave to start getting leaver queue, so trolls are still better off throwing the occasional match than simply leaving.
If you believe that, then you deserve to be stuck in the low MMR you likely are.
The reason I don’t believe bans are issued for intentionally dying or non participation is because I’ve viewed active profiles in-game that have hundred or thousands of games on Leoric and win rating between 5-15% with him and a KDA under 0.1.
if u leave matches ur like one of those headless chickens, you’re just the chicken who found the door to outside… look kid… the real way is to go afk in a bush near to a lane, open a video in youtube and wait the game to end… alt tab to the game to see if u ever see the message (ur getting kicked for inactivity) just hit some miniosn with the spell to avoid being kicked for afk. meanwhile you watch a video or do something else… and that way u dont play a bg game, u lose faster and u dont get leaver penalty