[sciurius]

After thinking about it, I couldn't justify the space taken up by the Amazon App Store app, so I deleted it on the two tablets...only to find I can't run MobileSheets Pro unless I have their (AMAZON) app store app installed!

This is the same for Google tablets... You need to have Google Services/Play installed to run MSPro (and, in fact, many legally paid apps). TitaniumBackup is the only app I known that uses a license file so it is independent from network and other tools.

Although for most purposes it doesn't matter much, for a serious and important app like MSPro I really would like to be able to run it standalone on a dedicated tablet that doesn't have any crappware installed.