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The way federation works, I would not ever rely on deleting things to actually work 100%.
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It takes time to send the request out to everywhere that might have duplicated it.
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The request may never be received.
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Instances can ignore deletion requests even if they do get them.
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Archival bots and even users can save it if they saw it and do not get any deletion requests.
Best practice anywhere on the internet is to simply not post anything you don’t expect to stay online forever.
EarthPlanet Canada