Data on Uber Usage in the U.S.
blog.secondmeasure.com
blog.secondmeasure.com
The stacked area charts specially are very confusing to read and are impossible to compare the changes over time of the different categories.
There also is no sample size given, which is relevant since the average values are close and therefore we can't easily say if the average values by subgroups are statistically significant at a glance. (I assume it's high, but it needs to be explicitly stated)
The title is also unanswered in the article. "More than You think" compared to what? Normal car/taxi traffic? All the data shows is that people ride Uber a lot.
To answer the question on sample size:
This analysis was done across >300,000 unique Uber customers from a very large, representative sample of US consumers.
Thinking about my own Lyft use here, I became a frequent user after discovering that Lyft Line was a great and cheap way to get to work if I was running late. So one could hypothesize that people become heavy users because Uber allows them to take a frequent trip affordably.
To quickly clarify: The growth chart only includes customers who paid for an Uber ride in that month, so any customers riding 0 times are not counted. The "Domestic Customers by Monthly Rides" graph simply takes that set of customers and breaks them down by # of rides in that month.
Bookings can grow more slowly than customers if customers are spending less on average. This is in fact the case - in July 2012, customers were spending ~$85 a month on Uber. This has dropped steadily over the last three years to ~$70 a month. This makes sense given that Uber has lowered its average price over the years, with the introduction of UberX and UberPool.