ShayeSaintJohn was a YouTube channel created by a Man named Eric Fournier, about a mannequin by the same name.
The account was launched on Aug 30, 2006 under the name "Elastic Spastic Plastic Fantastic" and uploaded 57 videos but only in the year 2007. Eric Fournier died on February 25, 2010 at age 42 and likely did not give the password to anyone else meaning the account could not be cared for by anyone else. On December 22, 2017, the account was terminated due to "multiple or severe violations of YouTube's policy against spam, deceptive practices, and misleading content or other Terms of Service violations." It is likely that new rules were added to YouTube, that the channel was now breaking, and since there was no one to fix that, the channel couldn't stay on the website.
While the original channel was terminated the videos are still easily view-able thanks to YouTube having high flexibility when it comes to copyright. Many other channels copied and pasted the channels videos including one which uploaded all the videos (not in the same order though) named "Shaye Saint John Archives" (linked below) on January 1, 2018. Since all the videos can stay it was likely not the videos that were breaking the new rules of YouTube.