This always happens with any game that was good, it starts off great but then the developers become greedy and start doing things that are stupid and ignore the people that play their game and genuinely loves it. The games lose the people that loved it and played it all the time and then it just dies and gets completely forgotten. If you need more money then make another game and put ads on that one too. Don't just make the game you already have unplayable because of the ads you put in.