I want to be crystal clear on what you're talking about, because I'm not sure I am. At first I thought you meant reccing is bad. Re-reading, I think you're talking about actually reposting? So if you wrote a fic here, and I reposted it on Ao3? I agree that would be unethical, even if I said "melannen on DW posted it." If that's what you're talking about. You did not give your permission.
I honestly think you just don't repost people's work for them unless they ask. Even if they posted it 20 years ago on a now-defunct archive. I would be horrified if someone posted my old work onto Ao3 for me. I've posted some older work there. I made the decision to do so, however.
I think linking and reccing is fine, though! But of course don't reveal RL identities if you're aware of them.
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I honestly think you just don't repost people's work for them unless they ask. Even if they posted it 20 years ago on a now-defunct archive. I would be horrified if someone posted my old work onto Ao3 for me. I've posted some older work there. I made the decision to do so, however.
I think linking and reccing is fine, though! But of course don't reveal RL identities if you're aware of them.