There are multiple ways ProsperOps derisks commitment within the limits of the AWS Service Terms. For context, our service has been operating for several years and we manage discount instruments on almost a billion dollars of annual AWS compute usage. In that time and at that scale, we have never had a single instance of our algorithms “overbuying” commitment.
Historically, AWS has honored cancellation requests on commits purchased in error as long as the cancellation request is made promptly.