Photic is a dive photography app published by Photic. You can permanently delete your account and everything in it.
This is the fastest route and needs nobody's help.
Email [email protected] from the address your account uses, with the subject Delete my account. We will verify that the request came from the account holder before anything is deleted — which is why this cannot be a form that acts immediately.
Your account is locked immediately — it stops syncing and you are signed out everywhere. Everything is permanently destroyed 30 days later. Signing in during those 30 days cancels the deletion and restores your account exactly as it was.
If you subscribe through the App Store or Google Play, deleting your Photic account does not cancel that subscription — only the store can. Cancel it there to stop being billed.