Monero isn’t like the other three, it’s P2P with no single points of failure.
I haven’t looked too closely at Nostr, but I’m assuming it’s typically federated with relays acting like Lemmy/Mastodon instances in terms of data storage (it’s a protocol, so I suppose posts could be local and switching relays is easy). If your instance goes down, you’re just as screwed as you would be with a centralized service, because Lemmy and Mastodon are centralized services that share data. If your instance doesn’t go down but a major one does, your experience will be significantly degraded.
The only way to really solve this problem is with P2P services, like Monero, or to have sufficient diversity in your infrastructure that a single major failure doesn’t kill the service. P2P is easy for something like a currency, but much more difficult for social media where you expect some amount of moderation, and redundancy is expensive and also complex.
Nostr is a weird being. You are correct that it is not peer-to-peer like Monero is. However, it’s not quite federated in the same way that ActivityPub is.
When using Nostr clients, you actually publish your same data to like six different relays at the same time. It has the built-in assumption that some of those relays are going to be down at any given time and so by publishing to like six at once you get data redundancy.
Monero isn’t like the other three, it’s P2P with no single points of failure.
I haven’t looked too closely at Nostr, but I’m assuming it’s typically federated with relays acting like Lemmy/Mastodon instances in terms of data storage (it’s a protocol, so I suppose posts could be local and switching relays is easy). If your instance goes down, you’re just as screwed as you would be with a centralized service, because Lemmy and Mastodon are centralized services that share data. If your instance doesn’t go down but a major one does, your experience will be significantly degraded.
The only way to really solve this problem is with P2P services, like Monero, or to have sufficient diversity in your infrastructure that a single major failure doesn’t kill the service. P2P is easy for something like a currency, but much more difficult for social media where you expect some amount of moderation, and redundancy is expensive and also complex.
Nostr is a weird being. You are correct that it is not peer-to-peer like Monero is. However, it’s not quite federated in the same way that ActivityPub is.
When using Nostr clients, you actually publish your same data to like six different relays at the same time. It has the built-in assumption that some of those relays are going to be down at any given time and so by publishing to like six at once you get data redundancy.