Finland ranks among the top countries by freedom of the internet. The only real mandatory blocking applies to child pornography. The Finnish government has prepared a blacklist of websites to block. However, it isn’t very accurate.
Reportedly, less than 1% of the 1600 websites showed content classed as child pornography. Less than 4% contained links that lead to such websites. The implementation is clearly lacking in this area. But ISPs are still pressured to start blocking websites based on that list.
If you want to visit a legitimate site inadvertently blocked by the government, a VPN will allow you to get past the ISP blockade.