Having worked in a hyper scaler on a system to orchestrate hw breakfix, it requires a lot of hands.
We replaced thousands of hard drives alone per day...
And racks are constantly coming and going. Hyperscaler DCs are busy places.
So? it's not like if hyperscalers weren't building datacenters, the billions that would otherwise be spent on GPUs would be spent on 10 car factories or whatever. The only reason the billions was being invested in the first place was because there's a craze for AI datacenters