"But if anyone did something, they'd just send a maintenance tech or branch flunky to clean it out, and they'd be back up in a couple of hours..."
Really? Riddle me this:
Would said branch flunkie or maintenance tech gain access to the ATM innards they would supposedly clean with a key, inserted into a lock?
Does Homeless Depot not also sell squirt tubes of epoxy and cyanoacrylate Krazy Glue...?
Asking for a friend.
I further remind all and sundry of the experiment in policing where the authorities in Rome attempted to curb Italian drivers' casual acquaintance with traffic laws by installing hundreds of traffic nannycams all over the city.
And within 3 days, God bless 'em all, the good Italian citizens stole or disabled every single camera.
High tech problems frequently have low tech solutions.