Recieved an email from my university that they would be optionally issuing a digital version of a diploma anchored in the BTC blockchain. What did we achieve when the docs from the university are manipulated and they put it in the blockchain?

What did we achieve when the docs from the university are manipulated and they put it in the blockchain? Couldn't the university just encrypt the data and put it on amazon aws? via /r/Bitcoin http://bit.ly/2wt8R45