Well realistically anytime you venture out into public or a "public space" (Which includes places where anyone can come in if they pay, like a train or movie theater.) You have no reasonable expectation of privacy. So I wouldn't call it wrong. Is showing people in an on ride video filmed at Disneyland that you put on youtube for monetary gain wrong? There are multiple channels that make on ride videos for monetary gain that include unsuspecting "extras" and those videos are seen by millions.