I have had my WoW account perma banned 4 times (appealed all and got them reduced to 3 days max).
I appealed the Hearthstone ban and they were much more strict. Like it was a totally different attitude. Like they had solid evidence whereas with my WoW acccount, it was probably a player report or something.
But yea, it is still 3 month ban
I even had someone from the Buddy IRC channel give me their account info and I got their WoW account un perma banned. I'm really good at social engineering and this Hearthstone ban is totally different.