A lot of old games have become unplayable on modern hardware and operating systems. I wrote an article about how making games open source will keep them playable far into the future.
I also discuss how making games open source could be beneficial to developers and companies.
Feedback and constructive criticism are most welcome, and in keeping with the open source spirit, I will give you credit if I make any edits based on your feedback.
Only if they still sell the assets.
I’m in favour of also dropping any copyright and intellectual property protections the moment a company stops selling the game. They evidently have no more commercial aspirations for the title, so it doesn’t need any protection from technically feasible copy protection circumvention methods.