Main group of user who Google adsense account get banned are new user who have not read Google adsense tos. They either have sub domain name like *****.blogspot.com, *****.co.cc, or any sub domain name which you got from your free host

And website owners who one only have one website which has very less unique impression like less than 200 per day and having more number clicks

And website owner having ctr higher like 100%, 150%, 200% even 500% as this kind click through rate is highly impossible for any Google adsense publisher to have with out involving in any click exchange circle

Basically they are the new blogger or website owners who all get banned

My advise to the Google adsense user if you have adsense account then also don’t use for very first blog or a website which has less than 500 unique visitors per day . Once you reach this mark then start using Google adsense or any other program as there is very less chance getting banned