"If someone is in a public space, like a park, beach, or sidewalk, it is legal to photograph them. They shouldn’t expect privacy laws to prevent them from being photographed. That means a street photographer can publish candids taken in public spaces, as long as those images are only being used for editorial purposes."

It'd be impossible to photograph a protest, rally, sporting event, or basically any long shot of a public area if you had to get individual consent from every person in the frame.