The Ducklings servers store basically all data you provide, your name, IP address, moves you make and things like that. This data is only used for gameplay. What you're probably concerned about is privacy related to third party vendors, ads and stuff like that. For more about this see the section below.
Ads and third party vendors
We don't target the Ducklings website or its services to users under the age of 13.
We may occasionally make changes to this policy. This document was last updated on September 9, 2019.