1$+ per picture is quite expensive for image storage. It will probably be used mostly for blackmailing and CP
The inevitable CP could cause legal issues for any central memo.cash website. Need decentralized client that anyone can run at home from scratch BEFORE jpegs easily stored on-chain.
There's a grim problem in our future: CP and other vile images that are even harder to expunge from the blockchain than they are to unsee once they're burned into your eye sockets.