You misunderstood me. I talked about software freedom, not technical stuff. Executing video game ROMs in a virtualized environment is practically running non-free software, since the source code isn't available under a permissive free software license (this isn't generally applicable to a software, since it depends solely on the author of the work, and there can be exceptions though).

Moreover, this doesn't affect only cartridge ROMs, but also all other applications that runs in an isolated environment (e.g. PlayOnLinux), and doesn't use internet connection, since the application can collect and send sensitive information from the host computer.

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