Perma for inting?

So I was in lobby with premade twice, 1st time someone dodged, and both times they banned what mid and top wanted to play and in game they decided to int for no reason at all. I really dont get it, I reported them but could you tell me why these kind of people play LoL and is this for perma ban? Luckily it was a normal game and not ranked. I mean I dont care about lose in normal but why do these kind of people exist
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