I think if you are subscribed and still playing the game, you should not lose your house. However, if you have been unsubscribed for over 90 days, I think that it is fair enough to lose the house because most people will not come back to the game if they left it for so long. Also, if this is made one of the rules of housing and people still choose to unsubscribe for so long, it is your own choice and should not compliant of losing the house after 90 days.