Nintendo has confirmed that the play limits imposed on Wii U demos are actually set by the publisher, rather than Nintendo themselves. Currently FIFA 13 is 10 uses, while Rayman Legends is 30 uses. Sonic & Sega All-Star Racing Transformed is 15. Although it’s down to the publishers how many goes you actually get on demos, it’s likely that Nintendo implemented the actual system. Xbox Live and PlayStation Network do not have play limits set on demos.
“Each publisher has the opportunity to decide how long demos will stay on the eShop, and how many times consumers can play them before they expire.”.