What FlipRadar stores
FlipRadar is a private tool run by Anthony for a few people. It keeps as little as it can, and nothing about the people selling.
About listings
For each listing it has seen: the marketplace's listing id, the title, the asking price and how it has changed, the suburb text the marketplace showed, the link to the listing, the link to its thumbnail, and when it was first and last seen. That is the whole record.
It never stores the seller's name, profile, photo, phone number or email, the listing's description, or the photos themselves. Photos are loaded from the marketplace when you look at a deal and are gone when their link expires.
About you
Your email address (your login), your name as you typed it, your home city, your watchlists and the deals they raised, and, if you connect Telegram, the id of the chat your alerts go to. Passwords are stored as one-way hashes. Sign-ins are recorded as sessions you can see and end on your Account page.
FlipRadar reads the public, logged-out Facebook Marketplace search pages, the same ones anyone can open in a browser without an account. It never logs in to Facebook and never uses anyone's Facebook account.
Who sees what
Your deals, lists and labels are yours; other accounts do not see them. Anthony, as the admin, can see the list of accounts, how many lists each has, and the poller's own numbers, not your deals.
Leaving
Ask Anthony to remove your account. Your lists, deals and sessions go with it; the shared listing records stay, since they name no one.
See also how it works.