Totally laughing with your joke, but of course (to speak to an argument being made above by someone else), there’s no expectation of privacy when you go into someone else’s home to work in a professional capacity.
You can’t know, unless the residents choose to tell you, whether or not security cameras are installed. A nanny cam, especially, is made to be hidden.
Besides, the perpetrator was in his ‘workplace’, so workplace rules apply. He wasn’t visiting friends on his day off.
