The stats can be misleading, nginx is very good at being a reverse proxy or software load balancer and tends to be put to use in those contexts with pass-thru to existing web servers.
Because the stats look at headers, the last header before hitting the internet will be the nginx caches.
Comments
Nginx with 14% of market share is indeed very interesting, very close to IIS (17%).
The stats can be misleading, nginx is very good at being a reverse proxy or software load balancer and tends to be put to use in those contexts with pass-thru to existing web servers.
Because the stats look at headers, the last header before hitting the internet will be the nginx caches.