Reality: No. Keys are small text files (a few kilobytes) containing hexadecimal strings. They contain no game data. However, distributing them is still illegal under anti-circumvention laws.
Nintendo's lawsuit against Tropic Haze (the creators of Yuzu) did not argue that emulation itself is illegal. Emulation has been legally protected in the US since the landmark Sony Computer Entertainment v. Connectix Corporation (2000) case, which ruled that reverse engineering for compatibility is fair use. yuzu prod keys
If you are downloading "yuzu prod keys complete pack 2025.zip" from a random forum, you are almost certainly downloading stolen digital property. More importantly, you are exposing your computer to potential malware—bad actors frequently bundle key packs with keyloggers and ransomware. Reality: No