Apple's server hardware isn't the issue: Apple is asking for a 30% cut when Readability is processing and distributing content. (Maybe; I'm not sure how the Readability app specifically works. But Readability is theoretically in the same boat as Amazon, where Amazon is hosting all of the content, and Apple expects a cut because you're using an iOS device, and Apple maintains that their curator position licenses them to revenue sharing from all apps, regardless of who hosts the content.)