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.
And also, modern gaming platforms are all very similar. Since last gen XBOX and PlayStation have very similar hardware to both each other and to normal PCs and the Switch is very similar to many Android devices. The wild times where console manufacturers designed crazy custom chips that were hard to port to and from are over and thus the engineers tend to also be more agreeable with different platforms.