Since Mobypicture has no "delete" account option and the manual deletion of single posts takes forever (and feels like work) you can use this script.
It's very hacky, but it works (although might take a while)
This is not because I don't like Mobypicture! I have used it for quite a while and had a lot of fun, but I wanted my old photos of the internet.
First authenticate in your browser with Mobypicture and fetch the cookie,
put the value in the cookie var you find at the top of index.js.
Then just run:
yarn
node index.js