Disappointed there's no women on the list. Even more disappointed that fully 7 of the top 10 have no indication of revenue.

Remember: if there's no revenue, it's not a business. It's a hobby.

EDIT: To clarify, (I noted someone else pointing out it's very US-centric, which is ANOTHER problem) I have serious doubts it's really the top 10 in the world. More likely the top 10 this author has heard of.