Yep, make that an opt-in feature, add some light ads, and you have a full business model. I believe they may have just wanted to spare themselves the headache

Yep, make that an opt-in feature, add some light ads, and you have a full business model. I believe they may have just wanted to spare themselves the headache of a money system and of people who would reupload other people's pictures or copyrighted works for their own profit.