Ultimately you are trusting the relay server to hold your messages If the relay is not trustworthy, it could reveal those messages.
The only exception I know of are encrypted direct messages which are still held by the relay but are encrypted with the recipient’s key. These messages still have a cleartext recipient id (so the server can deliver them).
So, if the relay is well behaved
- messages are confidential between you and the relay
- direct messages are only delivered to the recipient and are encrypted
- most other messages are visible by anyone that can connect to the same relay
- btw the relay can enforce a list of people that can connect (i.e. a private server) or just make it harder via proof of work (to discourage bots)
If the relay server is operated by the forces of evil, then the only thing you can assume is that direct message content is not visible, but they can see the message src/destination/timestamp.
I think the main motivation for nostr is censorship resistence - so if you are being blocked in one relay, you move to another - in terms of privacy/security it does not seem weaker than most other public message forums.
I don’t quite agree with some of the rationale
Having said this I do understand where he is coming from. And I agree that:
I would like to remind everyone that the GPL pretty much exists because of (1.). If anything we should have more GPL code. In that regard I don’t think it failed us. But we rarely see enforced (in court). Frankly most of our code is not that special so please GPL it.
Finally I think users do know about Open Source software indirectly. In the same way they find out their “public” infrastructure has been running without permit or inspection the day things start breaking and the original builder/supplier is long gone and left no trace of how it works.
Since these days everything is software (or black box hardware with firmware) this is increasingly important in public policy. And I do wish we would see public contracts asking for hardware/firmware what some already for software.
I wont get into the Redhat/IBM+CentOS/Fedora or AI points because there is a lot more going on there. Not that he is not right. But I’m kind of fed up with it :D