> In the absence of a publicly available official list of blocked hostnames

This is the icing on the cake right here. It's just awful that not only do websites get censored largely arbitrarily, there is no insight into the process and what is even blocked–the fact that someone had to literally check sites to see if they are being blocked (via a variety of different methods largely indistinguishable from a malicious actor :/) is just a truly horrible state to be in.