I thought communities synced over instances so if an instance goes down, communities are still accessible. Is this not true?

This is not true. ActivityPub (the protocol Lemmy instances use to speak with one-another) does not intend to be a redundant, distributed datastore. There are a few reasons for this. One is practical. It needs to be affordable to start a new instance. If the requirements for starting a new instance entail mirroring significant parts of the fediverse (a network of over 2 million users and 22,000 instances) it would be impossible for anybody to do it unless they were Google/Facebook.

Another has to do with trust. A community has a home. That home is chosen (ideally) because the admins can be trusted. That instance is the universal source of truth for that community. If communities didn’t live on a specific instance, they would be vulnerable to various forms of hijacking. The home instance has the final say on who has permission to comment, and who has permission to perform moderator actions. None of these actions could be trusted if they weren’t cleared by the home instance first. Third party servers perform basic validataion against the currently known ban list / mod list / etc, but this could easily be spoofed by malicious instances.

When an instance goes down, it is kind of similar to a netsplit on IRC. A queue of outgoing messages build up on your instance, which can be seen on your instance. Queues of messages queue up on other instances, which can be seen on other instances, but they won’t be synchronized until the destination instance returns (this depends specifically on which inbox the messages are directed towards - I’m not particularly familliar with the specific implementation in Lemmy).

Finally (though not really), ActivityPub isn’t designed to be a broadcasting protocol. In the case of Lemmy, and other Reddit-like clones, it effectively acts as such, but it is intended only to send messages to the places they belong. If you post a message and the subscribers to that message only exist on 3 servers, that message ONLY gets sent to those three servers, even though there are thousands of servers in the network (at least, this is how it is supposed to work in theory).

I might have some details wrong here. I’m more familiar with how Mastodon works (and how it fails) at this point after troubleshooting various problems on my instance.

let them fight

As somebody who’s generally interested in science and technology, HN also sufferers from terminal libertarian VC-brain. It’s a club for wannabe founders of unicorn tech companies who view themselves as enlightened ubermench. This doesn’t always bubble to the surface, but at times of controversy it is quite glaring. Most recently, when the founder of CashApp got murdered they were practically calling to liquidate the homeless, even though the incident - predictably - was the result of a personal dispute with somebody he knew.

Even if the subject matter scratches an itch, the community is not for me.

Ziq is not a trustworthy source on shit. That guy is well known for lying and impersonating people to stir up shit, and has a personal vendetta against any leftist message board that he isn’t personally capable of manipulating. He impersonated me and a few other members of Hexbear in the very early days when it became clear r/ChapoTrapHouse wasn’t going to settle on Raddle.

butt.holdings