title: Disable manually built urls for dynamic links
body: <p>Firebase Dynamic Links has a feature to build custom URLs manually: <a href="https://firebase.google.com/docs/dynamic-links/create-manually" rel="nofollow noreferrer">https://firebase.google.com/docs/dynamic-links/create-manually</a></p>
  <p>Let's say I connected <code>example.com</code> to Dynamic links and use it by creating custom links for youtube livestreams, among other things.</p>
  <p>This means that I had to allowlist youtube.com as a destination for the short urls.</p>
  <p>This means any user could create a custom link <code>example.com/?link=http://youtube.com/scam-video</code> and share it. Since people trust my domain example.com, this is a serious phishing issue.</p>
  <p><strong>Is there a way to disable this feature?</strong> There is an API I use to create the URLs I need on the fly, it makes no sense (to me) to allow anyone without authentication to be creating valid URLs with my domain.</p>