What do you think of this proposal by the people behind Spreadcoin?

http://spreadcoin.info/news/proof-of-bitcoin-node-white-paper/

They are proposing an idea called "Proof of Bitcoin Node". I only made a quick skim on the link above and I have not fully understood it well, but the first impression I got from it is that PoBN is basically another layer on top of Bitcoin that gives incentive to the people running Bitcoin nodes thru big data mining.

Now I am not much of a technical person so it would be nice if someone explains what Spreadcoin is trying to achieve and how big data plays a role in their idea.