A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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Actually, most contests, of this type, are idea grabs mostly, I'd be surprised if it wasn't...that said only such talk will work... you'll see...
Think this may have been an idea grab...they don't really care about the finalists...they just needed ideas for developing HoloLens Unity apps.