> therefore it cannot be acted upon, therefore it is totally useless From the examples, this seem to be the point. If you receive a 429, you know you can just

> therefore it cannot be acted upon, therefore it is totally useless From the examples, this seem to be the point. If you receive a 429, you know you can just backoff a bit and it'll work at a later point, but if you receive 999, you're not sure how to proceed, which seems to be what they (the service) wants.