Yes, you do have a serious privacy concern.
I think you are exaggerating calling the article sci‑fi, but there is some obvious speculation in it.
Isn't that overoptmimstic, expecting people to be “responsible”? What is going to happen if you set a drone to follow somebody else, not in California, but the Ozarks? How long will it be before Cletus takes a potshot at it with a twelve‑bore?