Firstly, this doesn't scrape prices - they pay for a live feed direct from the market.
Secondly, it isn't legal. They are protected by license agreement.
But stock prices is not what the value of SNL Financial and/or Capital IQ is for most people. I know a bunch of people who pay the $30K license fee for these (as well as Bloomberg etc) who barely use the stock price at all.
I wonder if it is legal to scrape stock market data and then republish it.