I never quite understood this concept of loyalty or commitment to a business entity. You might interview the candidate and take it to the final stage with lot of effort but at the end of the day, the candidate is offered the job by the business entity and not personally by the interviewer. I don't see why the relationship should go beyond the applicable law of the land.

Of course, once the candidate joins the company, regular interpersonal concepts between employees that involve loyalty and commitment can be pursued.