Are you talking about the "Linode Alert" emails? Those are user-configurable — in the email, they specifically state "This is not meant as a warning or a representation that you are misusing your resources. We encourage you to modify the thresholds based on your own individual needs."

If that's not what you're talking about, I apologize, but I've been using Linode for years (often with very compute-intensive projects) and I haven't seen what you're talking about.