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For me, it's going to be Fediverse or nothing
(lemmy.world)
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I think, as well as the issues you mention, another issue might possibly be duplication. Historically, search engines penalise duplicated content, even across different domains and federation kind of bakes that in.
That's a great point.
Search engines should fix this for federated websites if they still want the best search results.
For a solution now, I wonder if a 307 (Temporary Redirect) status code, redirecting to the original instance post, could work for search crawlers.