this post was submitted on 19 Jun 2023
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Technology
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This demonstrates a fundamental misunderstanding of digital privacy. You can never be guaranteed that data is deleted, just like you can never be guaranteed that someone has "forgotten" something. It doesn't matter what any entity claims they are doing under the hood, you have to assume they can't be trusted. That's not an expectation you can have, and not something privacy advocates are asking for.
I'm posting this comment publicly, and there's nothing stopping any random user (or non-user) from scraping this lemmy instance and archiving the data themselves. I know that when I post it. Same for reddit, raddle, any mastodon instance, etc. I can copy the text and usernames of everyone involved in that raddle thread and do whatever I want with it, there's nothing anyone can do to stop me.
To think otherwise reminds me of that first day on the internet kid meme. "I deleted my comments, hah, they'll never get them now!"
What I can demand is: if I send a message directly to another party, I want to be able to verify that that party and ONLY that party can read the message (end-to-end encryption). I can also demand that they not require me to dox myself to them, that they not run weird js-based fingerprinting/port scanning processes on my system/network, and that I am allowed to connect to their services through a VPN should I so choose.
You're talking about real privacy, the critiques above are all about exposure reduction (incorrectly framed as privacy). Good retention policies are still important for situations like trying to delete something that you regret posting.
An example I could think of from the other site is the very common occurrence of posting some relationship questions and then deleting them later so that the person they're about can't stumble onto them. In that case you want finding the thing you deleted to be nontrivial enough that it can't accidentally be found. Someone with both the skills and knowledge about what they're looking for may still find it, because it was once public, but that's a different threat.
Knowing that any information you share publicly can be stolen, I think the way Lemmy's instances have the original comment after you deleted it could help counteract people manipulating what you said after you deleted it, such as making a quote and editing "your" original post after it was deleted. But this could give a lot of power to the admins as well, as they could be the ones manipulating.