CloudKit will help out some small iOS-onlystartup apps, but it doesn't offer anything like the scalability and flexibility of AWS, or its platform agnosticism. It hasn't decimated anything yet, and it's unlikely it'll have a significant impact on any of the big storage providers.
If Apple's own numbers are reliable, then it looks like it's probably more like Amazon sell 2-3 times as many as Apple: http://gigaom.com/2013/06/12/apple-we-have-20-percent-of-the-u-s-ebook-market/ I'd still say that douses the idea that the iPad is the iPod of the ebooks market pretty thoroughly.
It's probably just an effect created from combining the textures from a few different photos. The photos will likely be taken at different times of the day, so blending the colours will normalise them, and might make them seem a bit washed out, creating the cobwebby effect.
Ignore him, it looks like he's making a pedantic point that requires you to read "popular" as pertaining to customer sat, instead of volume of sales. Which isn't the common understanding, the popular kids at school are the ones that have the most friends, not the ones that have the closest knit group of best friends.
Lots of smart TVs have those apps too, so I don't see how it can be an issue with the channels, must be that Apple don't want them to do it, or haven't got round to it yet - I suspect they're focusing on channels that are either US only, or can be provided internationally. More than a bit annoying.