There are more microphones and cameras in places that you would not think of.
The only issue is if these are to be entered as evidence in a court of law.
Who views what outside of this has no bearing.
I questioned this once in my early days at work (as to how and when to inform people appropriately so as not to compromise any AV) and the general reply was that this is the society we live in now, we should be expected to be recorded in any "public place" at any time. That there is no one common law preventing anyone filming etc in public places.
In other words, the onus is on one's self to conduct yourself in an appropriate manor were you would not incriminate yourself if "caught out".
Example, all 7/11 (here in NSW at least) have audio/video at the counter.
FWIW it is still illegal to record persons in private residence without their permission without a warrant AFAIK.