In this case it seemed to be based on regions or zones in rural territories. Anybody in those towns or villages, was in the wrong place at the wrong time, and no amount information was going to make a difference.
I don’t think they were going around, checking names and marking clipboards. By all accounts, there was nothing orderly about this one. Little more than a perimeter walked down to a kill zone. The people that got away had to move fast, and of the ones that made it out of the round up, it seemed to be children and people who played dead.
So, add computerized record keeping to the mix. Will it be used to hunt people down? It’s probably a concern worth considering, but really the modus operandi seems to be search and destroy eviction from a territory, to clear out an area, not understanding and targeting network nodes in a constellation of peers.