agl@ and I actually use an automated script to do what used to be the manual review for HSTS preload list submissions. The code is Google-internal at the moment [1].
Since this review is run manually at irregular intervals, this results in:
A slower, uncertain feedback cycle on HSTS preload submissions.
Extra work for the preload list maintainer (currently me) due to manual emails regarding rejections.
I want to run this review step automatically for hstspreload.appspot.com submissions.
AppEngine can't do this, so this requires spinning up a GCE instance and integrating hsts-review.go into the AppEngine code.
From https://crbug.com/587957