The free version of the RSS Reader is ad-free, but it lacked the option to mark all items as read. OK, maybe there are those in the Pro version, so bought. Unfortunately, there is also not there. In fact, I could not tell the difference betw. Pro and Free. Ultimately, no matter.
What I do (beforehand) is unaware that the Amazon App Store respectively be installed. must remain so purchased apps also work. The RSS reader bought the works after only when permanent data is sent to Amazon.
My choice of the Nokia X was deliberately :, it is "google-free". For the most part operate without all Apps "phone home" It has nothing to do with me having a "paranoia", it's more about me, the principle to determine whether data is sent.
Unfortunately, Amazon is not really different because of other, goes on even one step further and lets purchased apps "offline" do not function.
Conclusion: I work with the free version of the RSS Reader and accounted for the item by Amerzon Pro version under the category See dues. Once and never again :-)