Technically, the actual "slate" is protected but the names of nominees is not. That means the MOC may choose to do a press release with the names only but nothing further. Many MOCs do submit a press release while some do not. A typical response from an office not doing one is the privacy rules ... the real issues have more to do with those who did not get a nomination than those that did or an effort to avert constituent issues.
It is not uncommon for non-nominated parents to contact a MOC office outraged. There are any number of steps that are taken by some of these families that cause great amounts of work & effort for the MOC office, the SA & the Pentagon to verify/prove that the un-nominated candidate was correctly not nominated. It is because of the severity of some of these issues, that the vast majority of MOCs are well out of the process & use totally impartial committees to make such recommendations. For the most part, most nominations have been documented thoroughly & carefully reviewed to make it as objective a decision as possible & to ensure it stands up to the scrutiny of investigation.