What's app - at the beginning of the program launch, the apple store could download the app for money. After offered users - from the second year of use - to pay 1 dollar a year. But after the messenger was acquired by Facebook inc, this messenger is only an appendix to the social network. What's app analyzes user correspondence, processes, and later in Facebook/Instagram users see targeted ads that seem necessary to users (target).
Viber - Popular messenger charges for the use of the main functionality. But for a fee gives an opportunity to expand the possibilities of communication between users: make paid calls (Viber Out) and express emotions with paid stickers. Viber Out service allows you to call the city numbers.
It turns out that some popular applications make money by collecting user data and providing more accurate (targeted) advertising. In this case, it is not necessary to talk about the privacy and privacy of information about users.
It turns out that they are conditionally free! They exchange user information - to provide free communication!
-For all the energy, material costs of the technical cost of developing, launching and operating the messenger - its use can not be free!
Not so long ago, I saw on the Internet - a similar successful project that will soon launch.
It's Stegos! The Stegos app has a simple, understandable goal - to give interested users the opportunity to communicate with each other without fear that correspondence and information will be able to fall into the hands of third parties! This feature is provided by Blockchain technology.
I will not paint in detail, if you want anonymity and confidentiality, then you here!
https://stegos.com/
