Check out Asahi Linux, they run on Apple Silicon and have translation for 32 and 64 bit x86, so they even go further than what Rosetta achieved. Open Source as well.
I'd also love to see the source code of the embedded M68K emulator for PPC Macs. I believe there are two versions -- one interpreter style and one dynarec style.
It feels like keeping it alive could really help long-term x64 support on Apple Silicon, even if Apple decides to move on.