If you prefer playing on a PC or Mac, the Dolphin Emulator is the gold standard. Dolphin supports the WBFS format natively. Simply point the emulator to the folder containing your Mario Kart Wii WBFS file, and it will appear in your game list. Emulation allows for enhanced features not possible on original hardware, such as 4K resolution, widescreen hacks, and the use of modern controllers like the Xbox or PlayStation pads. The Mario Kart Wii Modding Scene

From a preservationist standpoint, the Library of Congress and other digital heritage organizations have recognized the necessity of format-shifting. As Nintendo ceases production of Mario Kart Wii discs and begins to shut down legacy digital storefronts, WBFS remains one of the few viable methods to ensure the software does not vanish.

Make sure to only use game backups that you own. Pirating games is illegal and hurts the game development community.

Less Wear and Tear: By playing a digital backup, you preserve your original physical disc and protect the Wii’s aging optical disc drive from mechanical failure. How to Play Mario Kart Wii WBFS on Original Hardware