A lot of old films were lost in studio fires, or simply not putting in the effort to preserve. The software industry, and games in particular, have not learned from this at all.

• https://en.wikipedia.org/wiki/1937_Fox_vault_fire
• https://en.wikipedia.org/wiki/1965_MGM_vault_fire - tellingly “Despite the fire, 68 percent of silent films produced by MGM survived, the highest rate from any major studio.”
• https://en.wikipedia.org/wiki/2008_Universal_Studios_fire - reportedly nothing irreplaceable was lost. But master recording for a lot of muscians were lost.
• https://en.wikipedia.org/wiki/List_of_lost_films - “half of all American films made before 1950 and over 90% of films made before 1929 are lost forever” and “A study by the Library of Congress states that 75% of all silent films are now lost.”