Suzanne Frey, the head of security at Google, admitted that third parties can read our emails and data from third-party applications. The good news is that you can revoke this action by Google.
It seems that we have to read the small letters in the digital contracts, since they can share our information but we can avoid it by configuring the applications. This is due to recent scandals on the subject. The companies have added configurations to prevent the unauthorized use of our data.
But there is no manual, we have to look as if we were the programmers. How about?
You will ask yourself in order, to know what you like and what you do not like to create publicity to sell you things.