Well within the budget of a private investigator or burglar or peeping-tom or abusive ex-partner.
No need to scale; plenty of privacy/security incursions don't require mass-surveillance.
That said, I'd suggest that the attack does scale economically . Think war-driving but with one of these setups -- cruising around in a van through a dense neighbourhood collecting short clips of cctv footage looking for something of interest.
Major conflict of interest for a big retailer to hold property beyond what they occupy themselves.