No it never happened before the only people that got banned was from cheating(which is a littlle easier on CFW).just a warning to everyone. Sony will likely fix this soon and also they will likely ban anyone that uses psn on that firmware (its happened before), so you may not want to use it on an account that your care about
Yes there even a program called fuckpsn that lets you prevent an eventual ban (which never ever happened so far)does this still work, just wondering.