No account, no login, no email. There is no way to create one, so there is no profile with your name on it.
Your ratings are not transmitted. Scores and any custom item labels are written to this browser's localStorage on this device. They are never sent to a server, because there is no server holding them. Clearing site data erases them.
Images are drawn locally. Saving or sharing a shelf renders it on a canvas in your browser. Sharing hands the resulting file to your own operating system; nothing is uploaded here.
What an exported image contains. Your item labels and fill levels, and nothing else — no name, no handle, no device identifier, no link back to a stored profile. Hosting produces ordinary access logs (IP, time, user agent) that have no connection to your answers.
Drawn in your browser. Nothing was uploaded to make this.