I mean, the YouTube channel I mentioned (rigaya666) has 40k subs and links to a niconico, a twitter and a pixiv account, so I don't know if that's rigaya's actual account or not. I also had no idea people were reuploading his videos somewhere else.
If that YouTube channel isn't rigaya's, then that's a huge bummer because they also used to include some fairly accurate English subs to almost every video. And it would also be one of the most elaborate clones I've ever seen.