The Super Game Boy has received a significant upgrade with the introduction of the Super Game Boy Plus, an unofficial enhancement developed by @BucketMouseBite. This new version addresses several limitations of the original Super Game Boy, which allowed Game Boy games to be played on the SNES but had a faster clock speed than the original Game Boy, affecting gameplay and compatibility with link cables.
Your understanding is incorrect if copying involves circumventing encryption or other means of protecting the data. That said, it’s not an issue for the Game Boy or Super NES.
17 U.S. Code § 1201 - Circumvention of copyright protection systems
Well that’s interesting. It does say the law won’t override fair use. But I assume it blocks it regardless.