The practical benefit here is not to make DK1 free, but to make DK1 better. It's a Fan eXpansion, and while we needed to be propped up by the original game code

The practical benefit here is not to make DK1 free, but to make DK1 better. It's a Fan eXpansion, and while we needed to be propped up by the original game code there was only so much we could do. Say, maps where limited to 85x85 slabs up until now, but in KeeperFX we allow maps up to 170x170 slabs in size.