they are probably gunning for known offenders think about it , it is much easier for them to search this way
format pc , change ip ,email address, buy keys by a friend , rmah with friend , don't talk with friend in game about it (they probably monitor chats) , not sure about hardware id tho vm might help? and any link to the old bots . if you done all this and still get banned 5 times a month db is probably detected but i tend to believe the first option