An announcement where, by whom?

Just scrolled all the way the whole last years of the lemmyworld announcements community and there’s nothing on it.

Are you sure you’re not confusing a specific community policy with the instance policy? I can see how posting an entire article in the post body or comment could be problematic, as it could be misconstrued as copyright infringement. But removing ads and circumventing user data mining is an entirely different ethics discussion.