Comcast didn't configure xfinitywifi the same way everywhere in Comcast country? Then what's the point of having one big internet service provider if it doesn't provide homogeneity as a service?

There's nothing to monetize here. I think censorship circumvention services like for example Psiphon should try harder than just hoping ports 53 are open. But Comcast country is part of the allegedly uncensored first world where there's no market for censorship circumvention.