Then the candidates are interviewed on film, which is later sent to the client company, and can be rewound any time. In the past employees of large corporations used to be sure that they'd be with the same company for most of their working lives. They had jobs for life. They had job security. Nowadays there is a lot of insecurity.
Workers are afraid of redundancies.
However, in many countries, companies which make staff redundant, have to pay them compensation. The employees who lose their jobs get redundancy payments.