Your photos will be stored forever on steem blockchain.

Actually, this is totally wrong! The pictures are never stored in the blockchain, only a link to the picture. Only the link will be saved forever, but not the server with the picture... In fact, the server change several times over the last year, and some of the old pictures are already not available anymore. The blockchain is distributed, and cheep to keep it online. But the pictures and videos take a lot of space...