Edgecast customers include some very popular websites, which are certainly used by consumers and businesses in China. So it's definitely a problem for China. Now, whether the Chinese government gives a fuck is indeed another matter. I'm sure they can browse whatever they want.
After living in China for a few years, I understood something: the only thing chinese government cares about is its longevity.
The whole system is designed to keep the party in the control seat. Economic growth was a way, now that's is slowing down, the party is finding other ways, but it would be a mistake to think chinese economy is more important than power for the party.
