What ticks me off is situations where I literally cannot buy a game. I would gladly pay $60 today for a copy of civilization 2 that ran perfectly on modern operating systems with the sound track and everything. I literally cannot buy it. It's not for sale on GOG because no one knows who owns the rights.
So there’s a need for a copyright registry that is affirmatively maintained. Forget to register and exhaust a generous grace period that comes with a substantial fee relative to lifetime earnings of the work or Copyright lapses permanently and irrevocably.