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The Fediverse is working just as intended.
(lemmy.world)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
Authorized Fetch has been a thing for a bit on Mastodon at least - but as far as I can see it's a global toggle rather than saying "If you present as a domain on the blocklist then you must be authorized to fetch this resource" (the selective authorized fetch I assume they're talking about).
Never used Akkoma though, so I can't speak for it.
Yeah the selective part I think is new. I believe Akkoma's authorised fetch is similar to Mastodon, though I've also heard it came at the cost of breaking MRFs (essentially policies to handle incoming messages, that can be custom-written if needed)