YSK: Your Lemmy activities (e.g. downvotes) are far from private
Edit: obligatory explanation (thanks mods for squaring me away)...
What you see via the UI isn't "all that exists". Unlike Reddit, where everything is a black box, there are a lot more eyeballs who can see "under the hood". Any instance admin, proper or rogue, gets a ton of information that users won't normally see. The attached example demonstrates that while users will only see upvote/downvote tallies, admins can see who actually performed those actions.
Edit: To clarify, not just YOUR instance admin gets this info. This is ANY instance admin across the Fediverse.
I'm pretty sure you could request it from any server. Just because it's federated doesn't mean the law doesn't apply to anyone else with personal data.
Isn't this an example of how GDPR can be morphed into an exhaustively wild over-reach that exerts control on open systems and end user internet activities despite being hailed as a privacy protector from corporations with teeth that every corp has already worked around?
Does bitcoin's blockchain ledger violate the GDPR in the same light, where even though a blockchain address is long, it is still identifiable in the same ways a username or even a random email address can by inspecting a data set and running a search for matching entries? If not, couldn't we just slap the Fediverse data into a blockchain style system for the whole Fediverse that each instance would act as a node on?
There is a person working on a blockchain version of Lemmy for the purpose of making the data content addressable and allowing it to be shared in a peer to peer system so that the main instance server gets less load. It seems like GDPR is getting in the way of progress or that devs need to do a lot more work on trust in the swarm to make it work.