Working Copy is designed to keep your information private. It does this by collecting very little information and using as few third party services as possible.
The app itself collects no information about you and refrains from logging how it is used. The WorkingCopyApp.com website will log requests to the server, the document requested and the IP address excluding the last number.
The Working Copy app asks for your name and email as needed by Git commits, but this is not transmitted to Working Copy servers only to Git remotes that you use with the app. The app contains no crash reporting or analytics frameworks with the exception of beta version that uses Microsoft App Center for crash reporting.
These universal links and the page presenting them have been created to avoid leaking data. Information is passed in the fragment part of the URL, that is never seen by workingcopyapp.com webserver and never leaves the browser. As long as you do not share Universal Links with others, they are entirely private.