This is all part of STS plan to shift customers around. They don't want you staying with one game. They want you jumping around and buying plat for multiple games. Let one go kind of stale, just enough so people go try the other games, and then before everyone gets too fed up, come out with another update. They gotta make money some how and when you are putting out F2P games, you gotta push your customers to spend money in anyway they can.