there was a recent post about buying the key to open your laundromat's machines and get free washes, I'll see if I can find it

EDIT: here it is https://hexbear.net/post/2062681

EDIT2: the post says laundromat machines are different from the ones in rental buildings but I'm not sure I understand why?

Also note I asked a friend of mine who owns a laundromat and he said that he doesn't have this issue, apparently laundromat machines don't usually work this way. I looked into buying one of those instead but honestly it was easier and way cheaper to just re-key the lock.