iOS competition with laptops

Yes, it is legal. I'm not sure why you would think that Apple has a legal obligation to make the features on an iPad match the features on a computer. That's like saying that Cannondale's bicycle's have to have the same features as a Ford car. Yes, they're both transportation devices but they fill different niches.

If the device doesn't meet your needs, you should purchase one that does.

You would certainly need to be less ambiguous in your explanation of what is occurring, but SkyGo, the media vender/supplier is free to make its product available on different platforms as it sees fit, regardless of what it makes available on other platforms. SkyGo is not legally required to make an app for the iPad offer the same services as an app it makes for a full fledged computer, regardless of the iPad's potential capabilities. They are the content provider, it is their product to offer freely to the public or constrain as they wish and see fit for their business model.

We have very difference answers, so one or both of us totally misunderstood the question. 😉

I think perhaps you had the correct perspective. 🙂 However, our answers are essentially the same: None of the companies mentioned is required to have feature parity across devices.