So they're being paid to drink rather than paying or did they pay it forward? Which is the inverse of them having to pay for what they consumed. What you're describing is very much like old school gift economics
which historically preceded the monetary system. Ask David Graeber: "In fact our standard account of monetary history is precisely backwards. We did not begin with barter, discover money and then eventually develop credit systems. It happened precisely the other way around." Debt: the First 5,000 Years by David Graeber
As most anthropologists now conclude the Gift Economy
was the ancient standard before the monetary system appeared, and in many historical cases was preferred. So there is still a difference. For example:
"Money is hereby abolished and libertarian communism is proclaimed in this village....The castle has been turned into a warehouse and supply centre. Everyone brings what they can and takes what they need. There is amazement and delight on the faces of women who help themselves to necessary commodities without paying." The Story of the Iron Column: Militant Anarchism in the Spanish Civil War by Abel Paz.
By your reasoning T'Girl, the items brought to the castle constitute a form of money or payment even though items were taken without "paying?"