I agree with your review. The idea sounds interesting, but like you noted, it's too easy to cheat if there's no way to "validate" if the person really changed his/her habits or not. I haven't played it to know whether the RPG part is fun or not, but if it were really fun, I wouldn't mind the rewards being just ingame stuff. But if the game were to have STEEM/SBD as rewards, I think it'd need even better validation, because if money is involved, people will tend to want to game the system even more...