Where does all the Filehost websites host their files?

[SSJ]

Some filehosts use Webzilla, since they don't care to much about DMCA, like Ecatel.

Most known established filehosts use Leaseweb services

Wasn't this just what MegaUpload/Mega use(d)? What other file hosts use this? Just curious

Mega is decentralizing servers in a lots of Datacenters like ColoCrossing.