Ah yes, I “fondly” recall a similar setup from the 80’s. free film with every roll processed, because the money was always in the film processing. Although this 60’s ad appears to be using generic film.
In the 80’s, the scheme involved using motion picture film (slides with negatives!) that seemed, to me as an ignorant pre-internet consumer, unlikely to be handled by your generic corner film shop. So you had a degree of lock-in. I escaped by gradually losing interest in photography as grad school consumed more and more time and money for frivolities like film became more scarce.
