What about a rogue datacenter technician that plugs usb devices into a few servers? Or a wiring contractor that installs a pcie card on your servers while they'

What about a rogue datacenter technician that plugs usb devices into a few servers? Or a wiring contractor that installs a pcie card on your servers while they're conveniently powered off during the weekend while they upgrade something? Sure, the $5 wrench attack makes sense to steal data from an individual's laptop, but keeping undetected persistent access to some servers/networks is, in many cases, much more valuable than a one-time data dump.