[E39M5S62]

I worked on PH infra for a few years -

* The frontend itself runs on bare metal

* A lot of the backend was built out as microservices, running on top of Mesos and then later K8s

* CDN was in-house. The long tail is surprisingly long, but the front page videos were cached globally

The unifying theme behind PH is that they host everything on their own equipment, no AWS/GCP involved.