That because hosting providers have their systems set up to bypass contained failures. Single failures are transparently compensated for, so you never notice th

That because hosting providers have their systems set up to bypass contained failures. Single failures are transparently compensated for, so you never notice them. The only system that could take down the entire network is (mostly) the load-balancing/failure-compensating system. It makes sense that the bugs in these system are almost exclusivly cascade failures.