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Exactly this. The pros and cons of open protocols. Does RSS solve this in any way? If so, the blogger or feedly have not implemented or used that part correctly. If not, we identified a missing piece in the protocol and getting that added to every RSS feed/aggregator is pretty much impossible (though a popular one like feedly should be able to adapt)

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There are at least a couple of ways of indicating that an entry should be deleted in RSS and Atom, but they don't seem to be well-supported.

This blog post mentions a couple: https://oleb.net/blog/2015/11/rss-feed-item-deletions/

I vaguely recall that Microsoft also had some proposed mechanism, but I can no longer find any trace of it. I doubt anything supports it.

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