In summary, the technology behind highly compressed Wii ROMs is a legitimate area of data engineering, focused on scrubbing, lossless compression, and format optimization. Its ethical application, however, remains strictly tied to legal ownership and personal backup rights. Without those conditions, the pursuit of high compression merely facilitates piracy, which undermines both game preservation efforts and the intellectual property rights of developers.
If a website claims to have compressed a 4GB game down to 50MB or 100MB, it is almost certainly one of two things: nintendo wii roms highly compressed