A rack of 48 Mac minis has been used to power Overcast podcast transcripts, powered by local Apple Silicon, instead of cloud AI services. Developer Marco Arment bypassed cloud AI to avoid the rising costs and limitations of cloud services. The Mac mini cluster offers a predictable monthly expense after the initial giant one, allowing for the creation of a custom compute cluster rather than a typical app backend. The cluster demonstrates that consumer Macs can handle sustained back-end tasks when the workload is predictable. The use of Apple Silicon's performance supports sustained AI workloads outside of traditional cloud environments, particularly for inference tasks with consistent demand.