And if the posts are not irrelevant, then they don't need paid promotion
Not sure it is as simple as that. I still think that promoting posts "artificially" is handy, particularly for new users. It is pretty hard to build up your list of followers without getting to Trending or Promoted, unless you are lucky enough to be resteemed by a Steem celebrity. So it is actually good for new users to be able to promote their post and get some attention. And IMO Promoted is way more clear than using bidbots...
Posted using Steeve, an AI-powered Steem interface
RE: A Simple Way to Strengthen the STEEM Economy