This is what Perfectchoice wrote in another thread, it makes a lot of sense.
"anybody who discloses information of their interview are actually reducing their chances of an offer, if it means recipients of that information can prepare better for their interview and score higher than the person who discloses the information. Why give somebody else an advantage to take your place? Not everybody interviewed gets an offer so you are in competition still.
To be fair, everybody being interviewed needs to start from the same position of only knowing the information the Uni sends you with the invite."