At least for this video, the author suggested that he made modifications for each reup, implying that more and more got covered up between iterations, which is why I called it censoring.
But totally agree with the posting else where thing - his twitter post of the original video upload announcement from July last year has people suggesting him uploading it elsewhere (like to Iwara). And at the youtube community post everyone is asking for a reup somewhere else as well.
But it's really the spirit of the dance that makes these videos so alluring. R18 mmd and 紳士 mmd on youtube has everything from completley sfw videos misusing the keyword with deceptive thumbnails and blatantly nsfw nude dance videos. But the really good ones are those that look normal at a glance but with cuts or glimpses of the good stuff - see through clothing, silhouette nudity, the good old upskirt, etc. I can only imagine that if you put so much effort into making the video seem sfw at a glance they'd want it on YT to get the most exposure. And if it's on YT why bother uploading elsewhere right? You don't get any feedback to your ego by having your videos archived away by the 0.1% of the population that's a data hoarder than having it ciruclat among niche anime sharing forums.
Everything that requires the 0 yen sub please. Use the backnumber feature and you can quickly get everything under that tier from each month without sorting through every post.