The gray goo scenario requires self-replicating nanomachines, so not applicable to harvesters that can't replicate.
The problem of where the energy comes from for micro- and nanomachines is very tough. But if you can make the landfill harvesting work, no doubt they'd harvest the hell out of the electronics in an office tower.
Robot foraging and energetics is my area of expertise. Pleasantly surprised to see a cogent comment come up on HN, thanks and nice to meet you!
The problem of where the energy comes from for micro- and nanomachines is very tough. But if you can make the landfill harvesting work, no doubt they'd harvest the hell out of the electronics in an office tower.
Robot foraging and energetics is my area of expertise. Pleasantly surprised to see a cogent comment come up on HN, thanks and nice to meet you!