One of my concerns is what happens when machines start making their own money. This could be possible with cryptocurrencies (another reason to loathe them.) Machines can do things online, make sex-working 3d-modelled chat-bots for instance, or do numerous other types of work, like things you see people do on Fivver. If machines start making their own money and deciding what to do with it, they could then pay humans to do things. At this point they are players in the economy with real power. This doesn't seem too far out of an idea to me.
It is very easily possible with normal currencies too. Obviously banks will need a human, or a legal entity to be the “owner” of the account but it is very easy to imagine someone hooking up an AI with an account to automate some business. Maybe initially it would involve a lot of handholding from a human, so the AI doesn’t have to learn to hustle from scratch, but if the money is flowing in and the AI is earning more money than it is spending it is easy to imagine that the human checks out and doesn’t double check ever single service or purchase the AI does.