Wasted effort. Back in 1996 IBM did the exact same, laying off workers 50 and older in mass. A class action law suit was filed going all the way to the Supreme Court which ruled in IBM's favor sighting as long as all those age 50 years and over were being treated the same it was not age discrimination. The Fortune 2000 have been doing it ever since. Once kicked to the curb, most corporations won't hire them either for the same reasons unless they have very special skills.
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*for high workloads. Yep. When they run out of credits (which happens a lot less often than our clients usually predict), the system handles the workload with the baseline performance. Depending on how well the software running on the server is designed, that can mean simply a few delays on the requests of the users; it doesn't have to break functionality.