The classifier's inputs are the actual denials from the log attached to issue
#1947: owned titles on an inactive account, a Plus title no longer in the
catalog, and an unreleased preorder Audible has no audio for.
The backoff tests also caught a real overflow: first * 2^n exceeds a TimeSpan
long before the cap matters.
Co-authored-by: rmcrackan <rmcrackan@gmail.com>
