Roku, like Apple, has been widely reported to be copying Amazon’s Channels model, but the underlying business model looks quite different. It is difficult to follow someone’s business model when you don’t know what it is and that is still the case here. Even Amazon seems unclear of its exact strategy over TV, although it is crystallizing over a mix of free content with its Prime subscription to draw people in and then a series of tiers at a premium above the basic price. At one time it looked like Amazon would just be giving all its video content away to build up its Prime subscriber base, but that would limit overall revenues as growth slows beyond the 100 million…