Actually, primarily they're reminding me that there's a human being on the other side of the screen watching everything I do in case I fuck up. How this is supposed to make anyone want to participate is a mystery to me.
edit: The weird thing to me is that these people are so hyper-vigilant to the damage bad behavior can do, and utterly blind to the idea that their own behavior can also be damaging. If I ever read a sentence like "we know that overmoderation and tone-policing can create toxic communities, and we're watching out for that" from a moderation team, I will know that this is a community that I can trust to be administered in an even-handed and fair manner. So far I have seen this once.