Ouya is technically within its rights to cancel Dungeons' funding, but there's no question in my mind that the Dungeons team was technically within its rights to do what it did to gain that funding in the first place. There's nothing in the rules that says family members can't donate, or that backers are limited to a certain amount, or that specifies where the money must come from. Gridiron Thunder backers kicked in nearly $1000 a pop on average, a hell of an amount for a mobile game, yet that's somehow perfectly fine. The Dungeons developers' only "crime" was to acknowledge what everybody already knew.
The developers gamed the system but Ouya left the loophole for it to step through, and worse, failed to close it when it became obvious that people were taking advantage. Its cancellation of the Dungeons funding is utterly arbitrary, and thus unfair - and in my eyes it looks far worse on Ouya than on the Dungeons team.