On October 31, 2022 YouTube started returning response 404 for the WiiU useragent platform.
This plugin now additionally patches the platform in the useragent for the YouTube app to NoU instead of WiiU, which bypasses this block.
Installation instructions
Make sure you're using Aroma then download and copy the GiveMiiYouTube.wps to wiiu/environments/aroma/plugins.
Special thanks to @ashquarky for the patcher framework, which made this a lot easier to implement.