Why riot let people intentionally leave game over and over?

Why riot not permabanning for intentionally leaving. look at shaclone stream He wait 20min low que and then join game plays 10 min and instantly afk. Im tired getting this player on my games non stop. Btw his name In game : Blut D Rache:

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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