This doesn't really address the morality issue. Suppose you could get away with it. The question remains, did you hurt people who didn't expect it etc.

When someone comes to play poker with chips, is it immoral to beat them and take their chips? No, they factored it in.

However, is it immoral to figure out a new collusion strategy and beat them?

Was it immoral to figure out a card counting strategy to beat casinos?

In other words, is it immoral to figure out new strategies in what is essentially an experimental game where participants assume there is risk?

In well established games like poker, which explicitly have gentlemen's agreements of "no collusion", it may be immoral.

But in a new experimental system such as a cryptocurrency whose software may be buggy, is taking advantage of the bugs really immoral?

When is it "buyer beware" and "a fool and his gold are soon parted"?

Isn't there any threshold for taking the money of a risktaker?