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Re:Show HN: Send free postcards worldwide by dewey on Monday July 13, 2015 @05:52AM (#9877169)
If you scroll down you'll see they have ads and a way to donate to the site.

"It costs us some to print and post your photos as postcards. Please support us to keep this service free, forever."

Re:Show HN: Send free postcards worldwide by bmir-alum-007 on Monday July 13, 2015 @08:27AM (#9877681)
De facto nonprofit.