The devices the article is talking about don't stop recording when you exit a "public space". They record everywhere.
As always, scale matters, as does the purpose of the surveillance and the affiliation of the surveilling party. This comment of mine from last month (and the document linked in the footnote) will be good reading for you. [0] Also keep in mind that private entities can be legally considered to be agents of the State... depending on how they and the State are conducting themselves.