Or, I don't know, maybe they can shut it down, legally. But it would be such a classless move they are unlikely to do it. Because you generally have to purchase official product to do it.
I'd like to point out, for the people that don't want to play on Goko, there is another way you can use the internet to play Dominion through the internet - Skype voice chat. I've played several games this way, maybe 8. They run smoother than you might expect.
Experimentation revealed that using a camera to play the game is kind of hard, but what works rather well is to simply recite things that are happening as you play. It's like the iso text log, except audio instead of written. Whenever your opponent announces a purchase, you just remove a card on your end from the game.
Skype offers:
Official card art!
Voice and text chat!
Full card customization!
Preserved sessions on disconnect!
Unlimited custom card usage and nearly 100% correct rules enforcement!
Somewhat facetious. But anyway, I encourage you guys to give it a shot. People like me that don't want to pay twice for the game can play all they want this way.
Send me a pm, anyone, if you're interested in playing with me. Or just use the thread to bash playing by Skype before you try it. Whichever.