It looks to be permanent bans, I just read on the demonbuddy forums and there are all these butthurt botters being like man, para 2100 GR86 crusader RIP and well didn't matter I wasn't even playing anymore. They are posting official account closure notifications also in their thread, I recommend to hit up their forums if you want a good chuckle! I guess one guy said he hasn't played in a month either, so seems like their detection has gone back some time, which is good. RIP to all the dbag botting scum!
These scumbags will bot every fucking season and after ban, they get an new account and go back to botting, god i wish blizz would just blacklist their debit/credit cards to keep em away from the game a bit longer
Looking at a lot of the forums for the bots it looks like d3helper, ROSbot and demon buddy users all got banned. Doesn't look like it's centralized to just one or two. Quite a few of them are saying that that they didn't start botting until after the tripwire event from demonbuddy. Probably just something that's been on going for awhile.