Sweden and Finland have system that do not only favor giving monetary service, but a lot of it is in additional education, so this really might save them some cost, because the real benefits of their system lays elsewhere.
I can't speak for Sweden, but at least when it comes to Finland, the justification for this experiment is that the amount paid is what people on unemployment already eventually get. But this consists of several different benefits which add a lot of bureaucracy - not only time-consuming for the unemployed themselves (living on social security actually requires quite a bit of effort dealing with various forms and agencies), but also requires a lot of people to handle all the applications, who surely could be doing something more productive instead. Whether the experiment will work or not (and should it be extended to everyone, including those who work, how will it be paid for?) we will see, but that is the rationale for it.
(and it is Finns, fins is what you have on fish)