The reason we didn't carry over the bans is because we simple can't. We don't have the old ban files, so we'd have to do it by memory and then only some of the people (the ones we remember) would be banned, and others who we forgot about, wouldn't be banned. So, it wouldn't be fair to some people. Everyone is getting a second chance, but that doesn't mean we forget what happened in the past. If they get banned again, we'll calculate that in their punishment. And, as Khali said, we have way better systems now to help us detect aimbots and a lot of other hacks, so they won't slip through again.