From my reading of this, it could also imply an unorganised set of the predatory wealthy all acting within their own self-interest, rather than a conspiratorial

From my reading of this, it could also imply an unorganised set of the predatory wealthy all acting within their own self-interest, rather than a conspiratorial cabal. That such 21st century robber barons are seeking to gain from Brexit is no secret. It is likely this is what the author refers to.