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Many of these companies are having to choose control and the ability to continue to make profit from their intellectual property vs they're games effectively being free in a historical archive.

Wonder if any of them would be willing to partner with a company or non-profit (such as the IA) if they offered to archive the code and artifacts for safe keeping but not automatically release it unless legally allowed to do so. Some things would probably stay under wraps for a long time, but at least it wouldn't be lost that way.