I believe there is some bad miscommunication in this thread.
I have an LG 65EF9500 TV which is a first generation OLED TV. The "webOS" TV Version is 2.2.1-1344.
I am unable to find a means to cast HBO Now onto the TV directly, and have had to resort to a Chromecast as part of my AV-system because of it. It works well -(good video and surround audio) but is a small pain to navigate on my iPhone). I am a Dish subscriber, and they STILL have no HBO!
There is no LG HBO (NOW or GO) app for it on the TV's OS, and there is no portal in the "Amazon Prime" app on the TV.
I believe that "webOS" TV Version with 3.x.x DOES support HBO, but not 100% sure. Will find out from a friend and hopefully report back.
So before you start calling people out with negativity, get the facts down, like which webOS version is installed on your model.
This info is found in Advanced>General>About This TV>TV Information>webOS TV Version.