Any particular reason this was article was posted on multiple sites, and multiple URLs with their dates redirect to this one? Seems a little weird that it "was

Any particular reason this was article was posted on multiple sites, and multiple URLs with their dates redirect to this one? Seems a little weird that it "was posted" today, when really it was posted multiple times. Yes, I realize it's the same author, doesn't make it any less weird. I bring it up because I'm not sure why qvault just keeps reuploading the same article and changing the date. https://qvault.io/2019/12/31/very-basic-intro-to-elliptic-curve-cryptography/ https://qvault.io/2019/12/31/very-basic-intro-to-elliptic-cu... https://qvault.io/2020/07/21/very-basic-intro-to-elliptic-curve-cryptography https://qvault.io/2020/07/21/very-basic-intro-to-elliptic-cu... https://dev.to/wagslane/very-basic-intro-to-elliptic-curve-cryptography-1k4g https://dev.to/wagslane/very-basic-intro-to-elliptic-curve-c...