"Hello Tetris fans! We've made some behind-the-scenes adjustments to improve overall gameplay and provide a smoother Tetris experience. Thanks for playing!"
I guess if it was honest it would have said:
"Hello Tetris fans! We've made some behind-the-scenes adjustments that we will pretend is to improve overall gameplay, but in reality, it is to provide a time-based kill switch to end your Tetris experience at a later date. Thanks for playing! (For now)"
I agree.I'd even go as far as to say that this behavior should be prohibited by app store rules.
Although, maybe Apple might want to keep policies like this around just in case they want to do something similar in the future.