The cloud began as a commodity business. Oh sure, there were small differences like the size of the RAM or the way the virtual CPUs were measured but the cloud offered a seemingly endless supply of seemingly identical machines. They ran the same distros and responded the same way on the command line. And if you snapped your fingers, the cloud service providers would give you root on another.
Keeping everything the same was the easiest way to lure the developers from the safety of their air-conditioned racks in the same building. Commodity machines mean there are no surprises or glitches. All of the clouds offered the most popular operating systems where all of the bits were arranged exactly the same.
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