I don't believe Twitter is open. Nostr can be compatible with closed systems. But they're not really truly closed. They're pseudo closed as I keep telling you the content still exists on multiple platforms and multiple relays. It would just be moderated on one specific platform. The way it's done is by a moderation event and then the client sees the moderation event and decides to hide it. So it's extremely client specific. This is done right now on Chorus.

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Make communities forkable. Same content, users, etc, but different moderation settings. Then people can decide what version they want, or if it doesn't exist make their own. Imagine if your favorite Reddit /r/whatever had mods that got out of control, but you could just fork off the sub and modify the moderation. 🤔
Just seeing Chorus. Cool. It's a very complex topic, gotta think more. I think I know how to solve the "base" Nostr trust issue though. Will try to work on that, and some other Nostr things. Nostr is about to explode.