it's literally just a waste of energy. You wanna prove that you don't manipulate your results? just give public access to your API and display the queries done in the background.
So you shift petabites of data from node to node? and you mine entries? well you could exploit idiots and it's lucrative as cryptokitties and others prove.
I was asked to build a crypto currency with a team, and they did the same thing they just took a usecase and threw the blockchain on the problem. Without any real value besides that there is "blockchain" written on it.
I starting to hate blockchain like the cloud and i thought AI would be a menace when every idiot needed to implement machine learning for a thing that a simple SQL query could've solved ... anyhow ...