✔ 最佳答案
Unless you have the recording function on your camera, no one is going to be monitoring who put their laundry into which machine at what time.
Another issue is people leaving their clothing in the machine for ages when others want to use the machine as well. This would not have happened if they came back in time for their laundry.
Like the other guy said, cost is the main factor. But the attitude of users can overcome many things. And... some people do have some clothing forgotten inside the machine and simply blame others. I have picked out clothing left behind in an apparently empty machine before.
Enjoy !
參考: Laundry days during university !