Keen observation skills.
I'd gathered they work in shifts and come and go at specific times of day but hadn't taken the time and energy to pin it down. You did. TY anon.
I don't filter, been around for quite a while, I manage but have to confess it can be tiring and once every so often I can't help myself and have to react, they are quite resourceful and even creative, I wouldn't be surprised if AI were involved at some point as they seem more astute than your normal chan mongrel usually is (no offence to your honest to god lower species dwelling around here with no bad intentions).
As mentioned earlier though there aint no cure for stupidity, alas.