[fabricexpert]

Is there really nothing better?

[StudentStuff]

There are better issue trackers, but the target market almost certainly has a Github account, and is searching for things on Github (rather than Google). Hence not hosting it on Gitlab or Bitbucket.

[sebazzz]

You'd say they use the issue tracker software of the Chromium project, which is essentially the issue tracker of when Google Code still existed.

[int_19h]

It's good enough, but more importantly, that's where people already are.