The logo has the username as well. I assumed it's to prevent people from copying and taking credit for other people's work. (That said, I do see these videos with the logo cropped out)
That said, I still see no reason why there needs to be a company logo or why the logo needs to vibrate.
It's much harder to automatically remove if it isn't static.
I assume you're one of the only people in the world bothered by the logo vibrating.
Are you kidding?. Of course that is shit for almost everyone. Animation on a page is one of the main motivators for adblock.
Only it's not a static page, it's a video: everything in it moves.
Things move in real life too. We’re almost hardwired to look at things that move in a sudden or erratic way.
I assume over a dozen people agree with me, since that's how many upvotes I have. I think a strong aversion to anything in the corner that moves is pretty universal–there's a reason why <blink> and <marquee> have been phased out.