The Norse Map used to have a little "about" section that explained how the map is a general aggregation of data and designed to show at a very high level what is going on, but doesn't provide any deep insight into each attack. The famous disclaimer "for entertainment purposes only" comes to mind, but in reality I think the Norse Map is just a really neat and sort-of functional advertisement for the capabilities of Norse. If you go to http://norsecorp.com, you'll see that the company behind the map is a security firm that wants you to pay for "real-time visibility into global cyber attacks", which means either signing up for their service that alerts you of weird activity on your network, or purchasing their appliance that can help block attacks at the point of entry. I'd conclude that the map is not really meant to actually provide real threat warnings, but rather a way to see into what the Norse Intelligence Service is capable of monitoring.

Norse is generally considered a joke by all the professionals I know in the infosec and threat intelligence industries, and not just for their silly map. Even moreso after their recent Iran report, done in conjunction with the political thinktank American Enterprise Institute. No bias there at all.

Agree, though I think the value in this is purely demonstrative to non-tech people, just to try to emphasise specific concepts.