We monitor nothing, and we do not keep track of our users. Like most of the apps and sites do, we too use analytic libraries, but we do that only to get an estimation of the number of users who are using this game.
In the web version, you need to register to play an online game. Your email address is saved on our database and it will never be given to 3rd parties. Besides the first email that is send to validate your email address, you will not receive any other emails from us.
In the Android version we ask for the Phone permission. We do this so that we can create a unique identity id and use that for your online statistics. Soon we will release a new version without that permission. In version 4.7.9 we no longer request that permission.