We have quite a lot of rules and regulations in place for how chickens are allowed to be kept. If you’re curious, Jordbruksverket has a guide on their website., assuming you’re not Swedish here is a machine-translated version.

According to regulations on disease control, poultry kept for food production must be enclosed when they are outside. This also applies if you sell meat or eggs on a smaller scale.

You may only have your birds outside without enclosure if you do not sell meat or eggs from them.

I think this rule was put in place back when there was a bird flu outbreak a few years ago. My old principal used to keep chickens, but she stopped doing that after the outbreak because she felt like the rules around how chickens were allowed to be kept after that was too inhumane. Granted I think she said that you’re not allowed to let them roam free at all so maybe she misunderstood, or maybe the law has been changed since.