They *have* noticed. In their last news entry they stated that they are going to change things so that locked entries cannot be cross posted.

The way I see it, anyone truly concerned with privacy would have all of their entries locked in the first place, so people bothered by the cross posting really have no reason to complain about it if their entries are public.

I'm on DW under the same name, but I don't hardly get on there except as an afterthought.