Sorry, I should have specified that only illegitimate ships would have a reason for doing it for the purpose of hiding from scrutiny. I do not know all the other reasons why one might do this, but it seems to me based on the content of this article that the set of retroreflector hits less the AIS signatures would yield only illegitimate ships.
In the case of maritime travel, this is actually the law of the seas, as discussed in the article. Whether it's true or not that you have "nothing to hide", you are not allowed to sail "under the radar". Same as how you are mostly not allowed to fly without a transponder.