I didn't realize looking for SSIDs was an active process. Why wouldn't it just listen for broadcast SSIDs? Is this only for hidden ones? Regardless, headline s

I didn't realize looking for SSIDs was an active process. Why wouldn't it just listen for broadcast SSIDs? Is this only for hidden ones? Regardless, headline should not single out iOS unless this is iOS specific - maybe it is? Readme says: "iPhones, iPads and other wireless devices"