DCs do indirectly create/support a lot of jobs, though. Construction is an obvious one, but even running a DC requires lots of additional people that often aren’t employed by the DC owner/operator.
I can absolutely attest to the fact that it takes even less than 20 directly-employed people to run an entire DC, including the racks of gear within it. But there are quite literally dozens and dozens more contractors and vendors involved in maintaining the facility and the equipment within them:
Physical security
Fire systems
Building controls
Electrical
HV and LV can often be separate sets of skills/contractors
Refrigeration
Mechanical
Critical mechanical - generators, etc
Regular mechanical - electric gates,etc
Plumbing and gasfitting
Water experts (cooling towers, etc)
Building maintenance contractors
Gardeners
And the list goes on. My point is that DCs can absolutely be a significant driver of employment and economic activity, just not all directly.