No, it's not useless. It means satellite internet is not amenable to constant streaming. SD or LD streaming can be done, within reason.
Connecting your DirecTV receiver to Hughesnet is a terrible idea. Even when not streaming a thing it will chew through your data by updating the guide, title descriptions, and even downloading movies into a queue you never asked it to download movies to.
I have three Windows 10 computers, which I use for different things, all kept up to date. Facebook, browsing, occasional YouTube videos, shopping, paying bills, etc. Oh, and I keep my folks' Windows 8.1 laptop up to date, too, as they have dialup.
Here's my status meter...
I've never reached 5GB of Anytime Data in any given month. I think one month I used a little over 7GB, combined. I guess Hughesnet isn't "fri***** useless." Then again, I don't rely on streaming as my main form of entertainment.
After upgrading to Gen4 I noticed the reset on the second (or third) day and came on here to ask about it. When I was told about the resets I took crazy advantage of it. I was downloading all sorts of things. Not only real, needed updates, but things I would never, ever really need or use, too. I was downloading BIG files just to see how long they would take. LOL.