A long long time ago, perhaps before some here were born (holy fuck), I worked for UPS in their freight division. I mostly drove a forklift, but also did everything else involved in unloading railcar/truck trailers and moving the contents to their next trailer to get to their intended destination. Job sucked shit. No union then. Pay was shit.

Anyway, they had on the job ad and sold it during the "interview" (the real interview was just showing up day 1 and having passed your piss test- everyone got the job because turnover was like 80%) about getting paid every week. I never cared that much, but as I got older and had others jobs I remembered getting paid every week and missed it. It was nice if you worked more hours in a week to then get paid for those hours very quickly. Getting paid every two weeks or even every month only once doesn't really matter much if your income is very steady, your hours never change, stuff like that since you just budget everything anyway.

But with a more precarious job, and that UPS job certainly was, the weekly pay did matter (we didn't get paid time off but there were multiple times my friends and I just straight up didn't show up for a week and then came back- no questions ever asked, lmao. Of course we didn't get paid, but they needed workers so much they literally never said a word. It was nice for late teens/early 20s). And I know the older guys there liked it too. I can't imagine in modern times when payments are all automated and fully digital that this cuts costs for them. It just seems like a "no, we do it this way" typical small business owner tyrant activity. UPS managed to give out physical checks on a weekly basis which obviously does have a cost associated. Distributing pay via ACH, to my knowledge, doesn't have fees associated with it. Maybe there's some fee banks charge for that depending on how much money and how many recipients, I dunno. Seems unlikely and also negligible if it does exist.