Are you suggesting that your program regularly contacts said interviewees with disregard for the match?
It is 100% NOT against the match terms for a program to offer information to an applicant about how they are ranking them, and many if not most programs do so. It is against the match terms for programs to inquire about rank position or to make conditional statements. You are likewise absolutely free to let a program know your opinion of them as well. However, there is a a special level of hell for applicants who tell more than one program that they are ranking them number one. On the flipside, there are programs that give very little information, and many of them are upfront about that as well.
I think Cambridge famously holds its cards close to its chest, while I think MGH's match list could easily be reconstructed as a function of the number of emails and Saturday morning phone calls you receive.
Most people understand that program feedback is not very meaningful. It's meant to make you feel good about the program, and to give the program the best chance of getting as high on their rank list as possible.
At my program, I was given the feedback, "If you rank us number one, we will see you in July." That's not a conditional statement, because where I ranked them would not affect how they ranked me, and whether I told them or not would also not affect my ranking. There was nothing unethical or against the match terms in that, and it made Match Day a comfortable experience.
