How does free prints make money?

Related questions

1. How can I get more prints for free?
2. Can I print photos straight from my phone?
3. Does Shutterfly prints good quality?
4. How much do Apple photo books cost?
5. How do I change the size of a photo for printing?
6. Does Apple still print photo books?
7. How much does it cost to make a photo book?
8. Does Snapfish print to Walmart?
9. Does Apple still do photo books?
10. Where is Snapfish based?

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