It is the act of running Dolphin on your "Xbox 360’s successors."
Like all emulation, The code is open-source. However, you must dump your own BIOS files and game ISOs from physical discs you own. Downloading ROMs from the internet is technically copyright infringement. This guide assumes you own the original games.
Running Dolphin on an Xbox Series X is arguably the best way to play GameCube and Wii games on a television, outside of using a high-end PC. Here is why:
Emulation software is legal, but downloading "ROMs" or "ISAs" of games you do not own is generally considered copyright infringement. The safest way is to "dump" your own physical discs using a compatible disc drive.
