[nunorbatista]

Author here. Thanks for the comment. I get your point, but if you have to teach someone how to turn on a computer, privacy is not exactly a topic that is important for that same person. It might be important to you, that will implement some of the measures under the hood.

Regarding the own cloud instance: you can easily buy a NAS and have your own instance of Nextcloud / QNAP cloud or Synology with a few clicks. These instances come with Native smartphone Apps that allow you to effectively host the data in your home.