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Is this based on ATproto ? I personnaly see new silos as something less interesting than ATProto apps.

I don't think so. If you self-host, you're on your own island and anything you write isn't seen unless you attract people to your domain.

Seems like a missed opportunity.

It seem to have rss, though. Perhaps that can help with the curation but at that point it becomes no different than a blog template/framework.