When Helldivers 2 was released it wasn't required that you connect a PSN account to it. So a lot of people bought it through Steam, and then Sony decided later on to make PSN a requirement. PSN isn't available in a lot of countries, so people who had already put time into the game in those countries are now unable to play. Steam is offering refunds for the game because of this, but people are still pretty upset and have bombed the game with bad reviews.
When Helldivers 2 was released it wasn't required that you connect a PSN account to it. So a lot of people bought it through Steam, and then Sony decided later on to make PSN a requirement. PSN isn't available in a lot of countries, so people who had already put time into the game in those countries are now unable to play. Steam is offering refunds for the game because of this, but people are still pretty upset and have bombed the game with bad reviews.