NMR is vital for Numerai, because they created “value” out of thin air and allowed them to pay out hugh sums. That would have been not possible with USD. They simply didn’t have that much.
Once the fund reaches some reasonable AUM, switching to USD will be an option. They will earn enough USD to pay out data scientists.
However, if the fund reaches high AUM, keeps performing well and establishes some reputation, you will be happy with your NMR.
Imagine Renaissance offering some crypto to join the fund. Would you join? I guess all of us would! Any “wannabe” trader/data scientist/investor/crypto-fan/idiot/influencer would want to prove themself in the most famous open hedge fund. That will drive NMR up!
Assuming the fund becomes a success, (Which seems very likely at the moment. Check out here: Investor Letter) NMR bet is safe. Even a good investment.