The phrase gan luach refers to a commodity that can be bought and sold but it does not refer to a human being.
Has the server contracted a corona virus? I typed "Tá sé gan ruach" accidentally and it was accepted. Reported it, mar is duine macánta mé. Earlier, I mispelled "salaí" as "sallaí" twice without any critique from Duolingo until the third time when it pointed out the mispelling and gave me a grace.