What a misleading headline. “You’ll probably be protected,” makes it sound like the method is mostly working, so don’t worry about it. But that’s not what the article is about at all.

It should be titled, “You’ll be protected probabilistically, and most data-collectors are not telling you what the probability parameter is that they are using.” The study shows that users can only make good and informed choices about their data when presented with this parameter, and an explanation of it’s meaning.