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Makes it easier to see what is new and what might be a re-post or old.
What do you mean by add a rule? An optional field when you post to input the year? Or do you mean have a repost count with link to past duplicates?
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Doesn't have to be an actual field, can just be a guideline for how you should post titles. Speaking of guidelines, maybe that's worth adding as well? Something like Hackernews: https://news.ycombinator.com/newsguidelines.html - not advocating for these particular rules, just guidelines in general.
The year guideline would help when someone posts an older link, for example I think this submission: https://www.youtube.com/watch?v=YSUVRj8iznU with the title "Taproot, and Schnorr, and SIGHASH_NOINPUT, oh my!" would be better titled "Taproot, and Schnorr, and SIGHASH_NOINPUT, oh my! (2018)" since it's from 2018.