Is it Possible to use Wii Wifi?

[Shonumi]

That thread specifically talks about efforts to make custom servers (primarily for MKWii irrc) in the later pages. Afaik, custom servers (or at least one custom server) exists and people are playing games on it: https://forums.dolphin-emu.org/Thread-nintendo-wfc-will-shut-down-in-may-2014?pid=324709#pid324709