In some of the cases yes! The simulation's subroutines are different for "NPCs" from the ones that populate "stuff and things" in various locations, so sometimes the shops/etc will look like they're operating normally, just without the presence of people. In other cases, they are simply "unused/unactivated" and so it looks like nothing's happening at all with them.
Kaneki is welcome to claim either of these kinds of shops! If you'd like, he may also experience periodic glitches where some NPCs try to "come to work" without any explanation and be very surprised that there's a "new owner".
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In some of the cases yes! The simulation's subroutines are different for "NPCs" from the ones that populate "stuff and things" in various locations, so sometimes the shops/etc will look like they're operating normally, just without the presence of people. In other cases, they are simply "unused/unactivated" and so it looks like nothing's happening at all with them.
Kaneki is welcome to claim either of these kinds of shops! If you'd like, he may also experience periodic glitches where some NPCs try to "come to work" without any explanation and be very surprised that there's a "new owner".