People do use Fedora. In particular, it serves as a great place to try out new features prior to them hitting RHEL, and is widely used as a development platform.

It has a very fast release cycle, however, so it's not always something you want to deploy in production if you still want security updates (fine if you can easily replace your cloud instances though) -- though there are QUITE a many folks running some impressive Fedora deployments in production, including renderfarms and chip design clusters.