The longer I've played, the more money they ask for (regardless of how much I've already paid), they add "features" that are just more asks for money, and deliberately interrupt timed benefits with self micropurchase popups to waste them so you get much less out of them than you could. And on top of that the difficulty is faked through RNG grind, to try to frustrate you into buying items that are not even remotely worth the price. Save yourself the rage and don't get involved.