It is currently hard for me and other developers to remove custom domains from projects.
A way for us to be able to remove these custom domains will give us more control and have the support team not have to respond to so many requests for removal.
Also if you were to reload the page and click custom domains again, it would ask for a domain name rather than showing the pointing url, so if you were to close out of the tab you cant find the pointing url. You would have to ask glitch to remove the domain and then you add it back to get the pointing url.