I guess there's a misunderstanding going on. This forum was created in 2009, we have a lot of post. I guess some of these posts are same with meaning, sometimes the words as well. Is it one of the reason why so many people get banned?
I am sure mods are aware that such thing may happen and make sure that the user did intentionally copy pasted the text and it wasn't just a "bad luck" before banning him.
If the banned member thinks the mod's judgement is faulty, he is allowed to create a ban appeal thread and ask to review his case.
Cellard is an old member here registered in 2014, he is a quality poster as well. His merits at least say so.
Anyone can make mistakes due to laziness or unawareness of the consequences of breaking forum rules.