I could imagine a very efficient and quick way for system updates could be built this way. Would reduce hosting and bandwidth costs for the system developers / maintainers and could improve the speed and availability of updates.
The only immediate concern that springs to mind is that if you manage to crack into this channel, you could potentially gain access to millions of computers in next to no time. In fact, I believe botnets work similar to this (from what I can remember of the Reddit botnet AMA...
If I remembered correctly, Facebook uses this method to deliver their 1GB PHP-converted-to-C++-then-compiled binary to their server farms because that's the only way they can update without crashing some central servers.
The only immediate concern that springs to mind is that if you manage to crack into this channel, you could potentially gain access to millions of computers in next to no time. In fact, I believe botnets work similar to this (from what I can remember of the Reddit botnet AMA...