I don’t think greed is the right word. The power dynamic is a one way street - there may be benefits for workers initially, but as you say, it will ultimately be centralised and controlled by those who already have power. The problem is structural - most people are driven by economic necessity rather than greed - and the structure is upheld by ideology, which ai will be used to reinforce through media and online social networks. It will accelerate capitalism to breaking point, but the question is, what comes next? I suspect some kind of UBI will be instituted to deal with mass unemployment, and that this income will go straight to rent - not just housing but also various rental schemes in the style of Netflix - a sort of modern neo-feudalism, with perhaps some kind of ‘service’ like military or other public work demanded in return for receiving UBI. Having said that, the professional classes like lawyers and accountants will be able to resist their obsolescence for the foreseeable future, even if ai could feasibly do their work, because they are quite a powerful social group in their own right.