The Finnish (or Nordic) system operates on the principle on rehabilitating inmates by reintegrating them into society, they do not confine them to a “typical” prison cell like those common in America (instead it’s akin to a college dorm with amenities). There are videos talking about the Nordic prison system you can look up to get the picture.
It’s the same with Norway: as they know that “keeping inmates in a cage beating and abusing them” doesn’t help, instead rehabilities them. (Look up Halden Prison) I mean, why is it that Finland manages to maintain a low recidivism rate while it barely scratches that in the United States?
Your answer is right in the information you provided. For some further context as well, slavery is still legal in the USA prison system so people realized they could make money with it and private prisons are a thing. They have been found providing kick backs to judges for harsher sentences, especially for minorities.
Add in the USA we don’t believe in rehabilitation but brutality with our prisons. The mentality is punishment, not reintegration. So you go to jail, get brutalized, traumatized further and then dumped with a felony conviction that excludes you from most work. You’re lucky to get a job at McDonald’s because of it.