I'm going to move someone's laundry and use both washers in an apartment building. It's going to be convenient.
Why would you do that?
Moving the laundry saves me time.
If someone was using the machines first then you should respect their property. When people find out then you will be banned from using the washing machines.
It's not a big deal and no one cares about washing machines. The point is I will wash my clothes in the machine and I won't pay for it by myself.
They will care. If you're moving other people's things then they'll complain to the manager and have your banned. That's why you shouldn't do this.