Great questions! The protocol does have suggested app-agnostic moderation primitives (see https://atproto.com/guides/labels, https://atproto.com/guides/creating-a-labeler). That's the basis of how Bluesky's own moderation works under the hood. There's also Bluesky-specific tools and APIs like Ozone (https://atproto.com/guides/using-ozone), but they build on top of those primitives.
replyOf course, nothing stops an app from doing moderation differently and not using any of that. This is more for better composability and interoperability.
I had seen the mentions of labelers, though it hadn't been clear that that was something general beyond Bluesky-the-app, thank you. This would have been helpful to have in the article, alongside the mentions of defederation. When people are asking about instances, sometimes what they want to know is how you solve the same set of problems they care about, so here are the solutions to those problems, etc.
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