Yes, I would still return it even though I know it comes from gambling, or trading or whatsoever.
Why? It comes from gambling though, then why give it back to him?
Even though it comes from from gambling or
trading or bounties or anything, I would still give it back. It is because he lend his time, patience, and even his money to earn that. It is not my money so I will give it back. As simple as that.