Pictures probably aren't a good example because they are covered by intellectual property laws.
Months later, I discover that I can sell my stock of credit card information on the darknet for some nice extra income.
Should I be allowed to do that? What if it weren't credit card details but just postal addresses?
If you think they might be used illegally, I believe there are already laws to charge you with that relate to facilitating a crime.
If you don't think they will be used illegally, then what's the harm in selling them to someone else?
Nobody likes getting a lot of junk mail, but it's not the end of the world. I actually got my first credit card from a pre-approved offer found in junk mail.
Pictures probably aren't a good example because they are covered by intellectual property laws.