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
Gdpr applies to servers within the EU, or for servers with EU clients. You can demand that they delete and stop transmitting data.
But you accept to transmit data all over the world, in the end that data could end up somewhere outside of the EU without any direct EU customers. Then all bounds are gone.
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Do worry about GDPR in conforming to deletion requests, but only your own data, not anything you transmitted.