And what happens if you don’t want the information available?
Best to not have the information in the first place.
What information is it though? That I was within a few feet of another phone on such and such a date, time and place? I guess I don’t worry too much about the government or anyone else misusing that info, even if they could access it, which the app manufacturer says they can’t. They’ve already got a whole lot more info on me than that. If I were really worried about that, I would not even go online at all.