Why is there no Android or Red Hat Enterprise Linux for IoT and Edge devices? The "one size fits all" approach of a modern Linux distro does not meet the requirements of the IoT and Edge markets because of the diversity of hardware and use cases - from cellular-connected sensors, to industrial IoT infrastructure, to gateways and even autonomous vehicle computing. More complex use-cases and more powerful processors almost universally use some variant of Linux. Simpler devices such as sensors typically use an RTOS. In this article we focus on Linux - a future article will explore the many RTOS options.