You missed the interesting bit. It's not that they're hosting on a cloud service that is interesting, it's how they've set up a completely transient hosting solution. Non of their cloud hosts know what they're hosting. There is no traceable connection between the IP number of www.thepiratebay.se and the cloud host. Any single cloud hosting service can kick them off their servers without it affecting the web site. If the connection between cloud host and load balancer is lost the cloud image encrypts itself and becomes useless.

Sure nothing they're doing is particularly novel, but if you're the sort of person who wants to host in the cloud, but needs to keep a website responding even when cloud hoster goes down (or decides to ban you), you should find something interesting about their setup.