Requires MetaMask!!
The app sounds very promising, and would likely be perfect, except that it requires MetaMask to store any and all earnings. Two huge problems: (1) I don't have sufficient storage space for yet another app, and (2) MetaMask's most recent reviews reveal that IT'S A TOTAL SCAM that causes you to pay super-excessive fees for every transaction, this causing you to lose money. If MetaGym used PayPal, then it'd be great. But it doesn't, so it'd be best to completely avoid!