After using the hack for a while, your cash, gold, and keys will be at 0, depends on how many you spent with the hack, I'm assuming it goes negative, but shows as 0. So playing without the hack will be impossible, because even thought you earn money for races, it still stays at 0.
On android I update the amount of money the race gives me, or enable the season prize with modified money, so when I claim it, it updates my money.
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This video is for an android, using game guardian, this is what i used for android, maybe something like this will be possible for iOS?
not modifying the total money, but modifying the prize/race/claim money, and then "earning it" that way it will be saved in the account
The video commentary is Russian.. But his steps are self explanatory