This application is the internal tool called 'Buganizer' that everyone at Alphabet use to file bugs. It's exposed externally in a limited way that allows people to file bugs for Google products (such as Android), but generally, not much else.
I know this is at least true for AOSP. I tried looking for/filing a bug with AOSP, and I wasn't even allowed to look for similar bugs unless I was signed in.
I get requiring to sign in to file a bug, but I was a lot less interested in even trying to when the entire thing was walled off.