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Re:Show HN: Self-generated custom art for your home or Airbnb by kazkada on Wednesday January 24, 2018 @08:02AM (#16222328)
Generated PNG does not mention OpenStreetMap. It seems that it violates OpenStreetMap requirements laid in http://www.openstreetmap.org/copyright/en:

"How to credit OpenStreetMap

We require that you use the credit “© OpenStreetMap contributors”."

Re:Show HN: Self-generated custom art for your home or Airbnb by rmc on Wednesday January 24, 2018 @09:23AM (#16222844)
There's also slightly more requirements than that. The credit must be placed so a reasonable user will see it. This is important if you have (say) an app. You cannot just bury the credit deep in the settings screen.