Last-minute bookings work in favor of a guest using a fraudulent payment method that doesn’t get discovered until after check-in. The guest might be trying to get one or more free nights, or they might want a place for a few hours for some nefarious purpose, including stealing everything on the property. Last-minute bookings are also one of the “red flags” for parties. In pretty much all cases, the scammers are targeting whole-place listings with off-site hosts.
I imagine now more hosts are willing to accept last-minute bookings out of desperation, so scamming has increased.