HBO Go is what you use when your HBO account is thru the cable company.
HBO Now is a stand alone app, for HBO without cable.
HBO Max is something new entirely....not sure how things will work. I had HBO thru Hulu and it just switched to HBO Max, now I can't access any HBO content. Hulu told me that I needed to download the HBO Max app on an approved device....neither smart tv or Roku is an approved device. I told them thanks but I'll be cancelling.
Guess it's back to HBO with the cable package.
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