"why?"

I put about 15 hours into this game over 3 days, and would have spent more time. However, although ads are not required, like with most mobile games you can choose to watch an ad to get some advantage. I would watch the entire ad and when it finished the whole game would freeze and I wouldn't get the advantage and I would have to hard close out of the game and try again. This didn't just happen once or twice but consistently, in order to get the advantage I would have to watch 2-4 ads closing in between to get it to actually recognize that I watched it. Super frustrating and made it where I di