Is this really changing anything? I suppose with over 1000 people there is more chance of an infected person being there, and more people to be interacted with

Is this really changing anything? I suppose with over 1000 people there is more chance of an infected person being there, and more people to be interacted with. But if that infected person is walking around anyway, is it really better for them to wander the streets going to other random locations, infecting other people? I'm not sure it's an effective gesture.