That is a worry, but I think the narrower worry is that an ask me anything sticker, in the light of day, is different from a late-night ask me anything sticker. When one originally puts it on, one might be prepared to say "sorry, not answering that," but at a late-night session where the last twelve limit-pushing questions were answered and your executive function is depleted from it being late, you might answer a question you wouldn't in the light of day.

I think that it is still a good idea on net. Doing this sort of thing with other people actually does make them less of a stranger and more of a friend.