Maybe he detected 0 RPM without looking at temperature.... some controllers will just stop fans when there is enough cooling.

We had a bunch of racks and fan failures gotta be one of rarest one. Even on my personal junk I had zero actual failures, just one getting noisy

> Was still worth it because it's cheap, but they're cheap because it's not new and reliable hardware.

Not really different than cloud, they aren't buying top of the line servers, they are making their own just like hetzner, for cheapest per performance unit.