The Internet Archive is a path to both highlighting and providing these games, even if it’s operated without the original game publishers’ explicit blessings.
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Everything on the Internet Archive, which includes software and games as well as movies and video content, stays there under the
fair use provision in US copyright law. The Internet Archive places a lot of emphasis on the idea that the emulations and downloads are distributed for non-commercial use with attribution, and the service is maintained through donations.
Video game ROMs exist at the margins of legality at best. Most big video game companies outright condemn them and (rightfully, in many cases)
classify them as copyright infringement. But existence or temporary hosting of a ROM is different from committed preservation of one under fair use, which software hasn’t seen a whole lot of. That the games can now be emulated in-browser will go a long way to keep them alive and in the public consciousness.