Does what it says on the tin. It's also been updated in the meantime and now works for channels too (a previous comment mentions it doesn't work)

YouTubeへのリンクを、Googleに個人情報を収集されることなくYouTube動画を見られるサイトへリダイレクトしてくれる。スムーズに動き、とても便利。

Great way to watch youtube videos privately. Works better for me than invidious

It does what it says. Thanks "piped" team!