I think there should be a law that would disallow passwords for public wifi. passwords are soooo annoying (is that a 1, l, or I?) & if everyone had open wifi, then it could be utilized much more, lowering everyone's wireless carrier usage. also, you wouldn't need to worry about someone using too much bandwidth -- it would happen, but i doubt more frequently than with the passwords. Well, wifi could be throttled if it…
If it's got a password, it's not really public wifi. Isn't it usually complementary wifi for patrons of a particular business?
There's nothing about password protected wifi that makes it inherently non-public.