Depending on the specifics they may not be. I live in a Condo tower and my mailbox isn't visible from the street, so if you decided to take notes on me as I read my mail you'd be trespassing.

The specific scenario isn't the point - but the fact that a semi-obvious scenario could be incorrect sorta is. Regulations are complex and tech has a terrible history of playing fast and loose with regulations so it's not like an imposition of regulations would be inappropriate or unwarranted - there are good and bad apples, and the bad apples spoil the bunch.