In some controversial cases, webcams have been mounted in public installations such as washrooms so that voyeurs may watch the intimate goings-on of anonymous people.
This perspective puts us in the uncomfortable position of being voyeurs, where we know something that the protagonist doesn't: that they are being watched.
Tom would be a voyeur a voyeur so someone who without getting caught tries to look at other people while they're in their homes and so it's really bad because it's usually inappropriate.