why would people against transparency, use a public blockchain? Why would they be ashamed or irritated by @transparencybot comments? Perhaps , they think, deep inside, or not so deeply, that they are doing something that they shouldn't be doing.
Indeed, transparencybot comments could even be seen as advertising for others that don't know about bidbots, when they read the transparencybot comment and they discover it and think, wait... can I do this too?