I'm also claiming GoodDollar coins, it doesn't take much effort anyway and it might have value in future, who knows? I'm not sure if it's ethereum token tho, I can't find any link between the two tbh and regarding trading you can click on 'Good Market' and trade GS$ for some services, there is no 'real trading' value yet.
It is an ERC-token as mentioned in their whitepaper:
GoodDollar will operate on Ethereum using smart contracts that are written in Solidity with G$ designated as an ERC20 token. As a means to an end, transactions using G$ are run on an Ethereum sidechain, Fuse, which enables low-cost, high-volume transactions. As we anticipate that the scalability and efficiency of blockchain infrastructure will continuously improve, the protocol is designed to be dynamic, flexible, and adaptable to evolve with market developments.
Receiving G$ daily is exciting :-), and trading into services actually a good starting point. I do like to see a project dedicating UBI and trading on regular exchange would be interesting. UBI would be a thing IMO.