Remember that Unity is not profitable. They desperately need a revenue stream, and they should have gone with plain old revenue sharing from the get go ("we get X% of your sales, so if you sell nothing, we get nothing, and if you move 2 million units, we get an amount you can quite easily part with"), they just came up with a batshit insane plan instead (and their CEO should be fired over that). That doesn't mean they can backpaddle on the part where they need an actual revenue stream, only the way they implement it.