I already check the 'Related Posts' if it is available to weigh who gets the upvote by seeing who posted something first, how much time passed between postings, and who posted the item to a proper sub.

It's sad that I sometimes check the Related Posts page for something and see that the duplicate for the same thing that was posted was also made by the same user just a couple days or weeks prior. Such low memory and attention spans people can't remember shit they saw or did a few days or weeks ago.

One thing that doesn't help is that I also see people circumventing the Related Posts detection by making their post a text post and not a link post and then pasting the link into the body, which also forces people to need to enter into the post to then access the link.

lol Name checks out.

Users can still post those links after being reminded they have already been posted.