Hmmm there would be some issue with putting this restriction on an account AFTER a customer purchased. You just have to decide if you want to wait the time and play or not. If you don’t, think about it. Pretty easy to get your money back.
And definitely, there would have to be a disclaimer on any new purchases, clearing stating this restriction. And if you are a recurring subscription, there are a lot of California laws that would come into play.
Really, you basically have to decide if you want to pay for a full month (in a seasonal game) and not really get to advance. I suppose you could just vendor all drops.
This move is quite unprecedented. Does it not ensure that a very very few number of new players will be coming to the game? Is this a way to kill the game off?