Sorry to hear that but as soon as money is changing hands using someone else's I.P. It was inevitable.
Charity or not, the lawyers would never let is happen. It is too bad.
Heroic effort, nonetheless.
Kudos
English
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It's worse. That is a service that actively seeks out copyright infringing. But. Yeah as soon as you tried selling these items, even if all profits were going to charity, you were on a clock. Better to be shut down now before you started making anything. Then they could get you for damages too.