This is television, not internet. You have at least three-four options depending where you live. Here we have Comcast, Verizon, Direct TV, and Dish which provide HBO content. Internet is an entirely different matter. The last two just lease off of Verizon internet (or provide shitty satelite service.)  Right now because of a dispute with comcast, I tether from my phone's unlimited 4G LTE data plan. Still haven't been reprimanded for it. 

Because anti-competitive practices require two (or more) companies to collude with one another, and that isn't happening here. There is just one company providing a shitty service, and a bunch of other ones providing a decent service. 

Erm, perhaps because Comcast is blocking it because it has its own set top box with Xfinity that they want you to buy in order to be able to access HBOGo. Hence they are trying to force you to buy their thing by bloccking access through a device you already own. Thus anti-competetive behaviour. And even worse if Comcast is not blocking the same from other console platforms, which would only be at the behest of some sort of deal with other console makers, which makes it anti-competetive on 2 fronts.

Comcast would likely argue that they're not blocking a service, just that they're not providing one (you need to use your Comcast account with an HBO subscription.) Using your logic though, are video game exclusives anti-competitive? 

Isn't that in violation of the new net neutrality rules, or have they not taken effect yet?

From what I can tell, if my friend came over with their Verizon account and I had a PS4 connected to Comcast internet they can log in and access their account on my PS4. So, yes, it is television. You subscribe through your television provider to HBO, and they allow you to use that account and subscription with the app. 

HBO providers, not internet providers. It says nothing about Comcast blocking somebody with an HBO subscription through another company using their Comcast internet to watch content. Unless there is some missing information that I am missing? 

It's not just Playstation. Comcast has blocked Amazon Fire TV and their response for the blocking is "business decisions".

Rumor is that they ask for a sum of money to allow it on a device. This actually really helped the net neutrality case, as the shady practices already exist.

I still use my Xbox 360 as my cablebox for my bedroom. It's great for that purpose.

I'm not certain, but that was my assumption. Usually these subscription things require a log in from your cable company, and that is probably how comcast is "blocking" the service, by not allowing you to use your comcase username/password. 

Well if you guys in the states have that many alternatives, why stay with comcast?