That limits his market considerably. What about the millions of people who choose not to relinquish their privacy to a jerk like Mark Zuckerberg?
The basic idea for his browser sounds good. But wouldn't it be a better business decision to make it more flexible, by allowing the user to select which sites he wants the browser to be anchored to?
Starting with a limited audience and then expanding outward is a good strategy to avoid growing too fast, crashing your servers and driving away people who won't come back. Not that a potential audience of half a billion is an onerous initial limit.