That's not true. It is possible to earn that much if you have legitimate sources of external traffic, such as a large blog following or social media following or you go viral on social bookmarking or social media sites. I've earned over $5 from 3 views on Quora before. And of course I have also earned $0.05 from 300 views before. But the point is that if you have a lot of good questions and a lot of external traffic, you can definitely make that much money. There is nothing in the Quora policies I can see about sharing your questions on social media or any other website as long as it's not fraud traffic. They even have an option built into Quora to share your question on Social Media.
But, Quora doesn't want that kind of traffic for the partner program. They want Google traffic and only Google traffic. That's their business model. That's what they are relying on to make their business profitable long term.
Edit: I also don't think this guy was 100% legit. It's a LOT of money. But, it is possible.