

It is for pull requests. A user makes a change to the documentation, they want to be able to see the changes on a web page.
If you don’t have them on the open web, developers and pull request authors can’t see the previews.
The issue they had was being marked as phishing, not the SSL certificate warning page.



How would that work? The use case is for previews for pull requests. Somebody submits a change to the website. This creates a preview domain that reviewers and authors can see their proposed changes in a clean environment.
CloudFlare pages gives this behavior out of the box.