The FAIL 100 list has been working reasonably well, but one crucial downside at the moment is the need for people to actively monitor it (both those that are aware that it exists, and those that don't know it exists).
While I certainly agree that it is a bad idea to spam authors in general (I'm certainly for opt-in CPAN Testers summaries and emails) does this still hold true when you are identifying only a small number of authors.
Would it be ok to auto-email the Top 10 positions on the FAIL 100 list, say, each week to let them know their module is considered to be important to fix quickly?
What if it's just the first time it appears, and on subsequent sequential appearances we don't email you.
What if it was the top 5? Or the top 2? Or top 1? Or only if you met a certain threshhold of FAILure score? Or it was at a wider interval, say, monthly?
When is it ok for a whole-CPAN process to judge that an author needs to be nudged?