Because I hear it's shit.
But then the article here http://www.news.com.au/story/0,23599,23746397-2,00.html says that the people behind it claim it to be fiber optic cables...
man...I don't know!!
If news.com.au tells you something, take it very, very, very carefully - and the New York Times as well. Both are biased to no end. News.com.au is partly owned by News Limited who I wouldn't trust if they were the last news source on earth. Plenty of inaccuracy, no accuracy whatsoever.
Really, it's a nice idea and all...but what's more important? Looking at others in London and writing to them, or putting it towards something useful.