Do boosted players get banned ??

Because i saw too many. I just hope something against them happens.I give you an example i got a twitch that was silver bronze bronze then suddendly this season gold 3+with 60%winrate.I dont wanna say luck...its probably too mutch but it looks like boosted so badly. Do they get banned???I climb on my own strenght and i dont wanna get d5 then deal with d5 boosted monkeys and we all know there is full of them.
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