Federated services have always had privacy issues but I expected Lemmy would have the fewest, but it’s visibly worse for privacy than even Reddit.
- Deleted comments remain on the server but hidden to non-admins, the username remains visible
- Deleted account usernames remain visible too
- Anything remains visible on federated servers!
- When you delete your account, media does not get deleted on any server
For a humbling experience just seach for your Reddit and Lenny IDs on a seach engine. You will get a list of everything you have posted. Also some account info. It is all public. What happens when deleted, depends on who has scraped the data and their retension. This is just how public forums are and that goes all the way back to Usenet and listservs.