The analytics pages are based on what the stats5 servers processes, our data is not a complete representation of all Overwatch players (much like all other stat trackers). However, we maintain one of the largest databases of Overwatch player data.
stats5 is updating Overwatch player's statistics 24/7. Not just from visitor requests, but all the time.
Everyday, thousands of profiles are processed through stats5 servers with hundreds of hours of hero playtime. With hundreds of unique statistics per player ready to be served to visitors in a matter of milliseconds.
We process thousands of hours of hero playtime everyday which we use to generate these analytics pages and calculate our hero pick rates.
Not all of our data is in numbers. In fact, there's a lot of processing to ensure every account's battle tag is up-to-date within minutes of it being changed. Here's the top 20 most popular names (case-insensitive).