What is the benefit of using a blockchain here? Why do you need distributed and decentralized consensus? I mean on the face of it this just makes no sense. What

What is the benefit of using a blockchain here? Why do you need distributed and decentralized consensus? I mean on the face of it this just makes no sense. What am I missing? EDIT: IMO https://en.wikipedia.org/wiki/Bitmessage https://en.wikipedia.org/wiki/Bitmessage was a far superior alternative to this.