Sorry, I wasn't questioning where the files are on the net. I've never bothered looking before, but, I'm not surprised the books come from an Akamai server. That is the service they provide.
You seemed to be saying that Kobo was putting books on my device that I hadn't asked for. From experience, I knew this wasn't the case. But, I see you were really questioning the content of the previews.
For the font file size, it is whatever is need. They can be stripped to just the needed elements, but I most book designers don't seem to do that. So, they end up being the biggest part of an ebook.
The links used are protected on Kobo's side. And you need a key to get them. Plus they check you have permission before sending the actual download link. If someone was sniffing the traffic, they could work out the URL for the books. But, based on the URL used, trying to find other books will be long process. It could be more secure, but, whether it is needed, I don't know.
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