Many other mobile games haven't had this kind of reaction.

Gungho's Puzzle and Dragons is one of the most profitable games of all time; it was the first mobile game to break 1 billion in revenue per year. It was released to the NA market 3 or 4 years ago and has continued to increase its player base month after month. Not only that, but they have unprecedented retention. People are still playing it 3 and 4 years later, you just don't get that with any other mobile game.