I know that I delete unread about 80% of the internal company emails I get because they're not actually useful, and have better uses for my time.
An email like this, assuming that my own projects are not often mentioned in them, would rapidly get ignored, I imagine.
If the goal is to have the affected teams alerted to the situation, it seems like it would be better distributed directly to the teams individually (a targeted email just to the teams involved) rather than spammed to all of the devs in the organization.
In the original comment:
> Especially if their PM leaned on engineers to make the experiment "quick n dirty" and therefore hard to clean up.
The PM then just needs to say that they don't have the time to cleanup because they have shit to do, and there's folks out there who pretty much live for this, and are usually well seen by management because they're management's executioner: no matter how shit the idea and execution, they'll get it rammed in.
I believe I read about it in a book (perhaps Software Engineering at Google) in the context of test coverage; using a leaderboard for gamification.