Custom domain feature is unusable
If you visit for example: https://bb.kjarni.cc/
Which is set up as a "Custom Domain", you will notice that you get a very massive certificate error.
=== Possible Solutions === Not directing me to a secure site under the CNAME'd domain. Using a non-secure site to redirect me from the CNAME'd domain to the actual domain. Using a non-secure site to create an iframe to the target site. Making "Custom domains" be a subdomain of bitbucket.org using a certificate with *.bitbucket.org as an alias (see kjarni.cc's certificate as an example).