there are streaming devices, (smart TV's), that allow a 'hack' that uses VPN's to 'sneak' onto Sunday Ticket broadcasts. For example - with the Fire Stick you can use Kodi.. as mentioned above.
I can't speak to the legality of this but I suspect it's not. As an individual it's likely not an issue... however the VPN is likely to be turned off, (blocked)... unless they are 'very' clever and ahead of the game.
It's possible that GearTV has somehow solved the blocking VPN issue, (for now), and yeah... you could get Sunday Ticket that way.
Here's the 'mystery'... and I don't have the answer - GearTV is boldly SAYING you can get Sunday Ticket with their service.... hmmmmmm..... well, Kodi has been around for quite a while so I'm guessing it comes down to providing an app, on a streaming device, to 'allow' YOU to get around the rules is legal, or semi-legal being somewhat 'blurry' by law. I don't know.... but it's interesting.