See the graph below from Alexa. The "Unique" visits are somewhat by chance. This is a good thing that gives Steemit more visibility.
What is being skewed is the actual Alexa rank. I believe that as more Steemit blogs exist, then the probability that internet traffic to Steemit increases.
In addition, Alexa shows that the majority of the internet traffic comes from the United States.
Well, wait a minute Alexa... Clearly that is not the case. Or is it? My followers are primarily non-US residents. Here is why I think that Alexa is off. Steemit blogs are often in English. Why? it just happens to be the language where the majority of payouts and visibility exist. This in turn creates search engine hits that are primarily from the United States. Many of visitors are here by chance. What Alexa is not showing is the true usage of Steemit which is much more diverse than is shown on the Alexa website.
What we really need to have a census performed. I'm no programmer, so I cannot perform a census. I was able to find one that was performed about 10 months ago, however, I think Steemit has changed dramatically since then creating a more diverse community of people around the world.
In addition, Steemit is one of several apps. This growing number of special use apps and their popularity takes away Alexa traffic from Steemit. This is not a bad thing as STEEM is the platform that houses Steemit and the other apps.
Steemit has visibility that can't be undone. Blogs will continue to fill the space and grow to flood search engines. Eventually searches will always have a number of results that include blogs from Steemit. Diversity in the Steemit space is also growing which further solidifies Steemit existence and growth. The growing number of STEEM apps may be watering down the Alexa ranking for Steemit, but only strengthen the STEEM platform.
For a breakdown of how Steemit Rewards system works:
https://steemit.com/steemit/@socky/steemit-rewards-breakdown-a-simplified-explanation-with-illustrations