A version bypasses that server check. It modifies the DOL (executable code) inside the WAD to skip the authentication handshake.
In 2021, a similar channel called “WiiWare WADs” was terminated after receiving two copyright strikes from Nintendo of America. Wii WAD Fixed has survived partly by keeping videos as demonstrations rather than direct downloads, and by using external archival sites that are harder to target with DMCA takedowns. youtube channel wii wad fixed