While an interesting use, abusing DNS in a similar way has beena long known (15 year) security vulnerability. For example, OzymanDNS. Even then, that was just

While an interesting use, abusing DNS in a similar way has beena long known (15 year) security vulnerability. For example, OzymanDNS. Even then, that was just one of the first published exploits. People had been performing DNS tunneling for some time. There are detectors of DNS abuse that I imagine the people who actually would store files in DNS would not want pointed at their files.