"How do I quickly share pictures without having to worry to much about them sticking around" is the problem snapchat claimed to solve (and does a reasonable job of solving, despite obvious limitations).
People might have actually been willing to pay for that, but if you charge money from the beginning for this kind of thing, someone else just offers it for free and tries to monetize it after they got all "your" customers.
People might have actually been willing to pay for that, but if you charge money from the beginning for this kind of thing, someone else just offers it for free and tries to monetize it after they got all "your" customers.