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
Checking against a known-malicious hash is very different than claiming to have access to the plain data. In fact, even for the known-malicious hashes, the companies doing the checks usually don’t have access to the source data (so i.e. they don’t even necessarily know what it contains, just that it’s not allowed).