The dev makes up tiers every other month, nothing new. However, I will admit he makes stuff available for lower tiers relatively quickly than anyone else using this model really, so I don't think anyone should complain about it personally. Higher tiers exist so whales can pay devs they like every month, and it's better to play a game which is bug tested.
What I don't like is the scene removal for PAYING people, and it's still a dev's choice to alienate lower tier subs. Up to the people to decide whether to sub or not.
Otherwise, the game is free with less content so whatever.