“This is really going to impact institutions that we take for granted,” Internet Archive director of archiving and data services Jefferson Bailey told the Standard, “like our museums, our historical societies, our public libraries, our academic libraries — just a lot of people that keep information free and accessible and online.”
Not just games. Full operating systems from the 60s and 70s are being kept alive by hobbyists. Unfortunately there is no law or rule about proprietary/company specific software. In 50 years (or less) historians will know more about how the Romans did banking than how it was done in the early days of computing.