That's an interesting article. It explains why there are so many anti-Coinbase shills trolling this forum at the moment.
Can you smell the panic?
No one likes coinbase they're a shitty business whos purpose is to leach money out of crypto and turn it to fiat.
They allow Americans to use bitcoin easily. In 2013, when Forbes did a series of articles about trying to live on bitcoin, it wouldn't have been possible without Coinbase - they essentially allowed the writer to transfer fiat to Coinbase, buy BTC easily, and then use it via their app. With everyone else you need cumbersome (and expensive) procedures to purchase it if you are American (Europeans have it easier thanks to Kraken).
As of October 2015 Coinbase had 2.7 million customers - I don't think any other bitcoin service has that much reach.