Did you check to see if your login info had been stolen from another hacked website?I wouldn't necessarily say easy, but nothing is fail proof. And yeah, I was hacked back then.
I was hacked out of revenge, I spoke out against a scammer and he took the account over. Most people were wise because they know I don't sell ... I didn't recall GRF selling on the forum, which was a red flag to me.
I suggest everyone check their stuff regularly