Alternatively lets make a coin that says it is forbidden to exchange it for fiat :)

That was the original idea for the project I am working on (a replacement for Steem) as a way to also prevent the tokens from being securities, but it also required we prevent the tokens being exchanged for any fungible asset including other tokens such as Bitcoin. But I couldn’t reconcile the centralized entity needed to enforce the EULA with the necessary decentralization. So I thought of a better idea since then.