You can now no longer subscribe to The Elder Scrolls Online for more than 90 days, Bethesda has done this with no warning at all.
Most games have taken away the longer subscriptions before they make the leap to F2P. This is to avoid those who have paid for it, so they don’t get angry with the change in the game.
This might be because most people do not see the game as a good enough MMO. Deciding that they won’t pay because of the bad reviews. This might be their way of inviting more people to play their MMO. Which sometimes works out.