Just watched this recap video from Zachary Michael and in the beginning, he mentioned something that I thought was quite interesting. (Timestamp 02:23 onwards)
According to him, he had been approached by a journalist who was looking into Gorlworld and they did an interview quite a while ago. Then, the journalist recently notified him that the reason why the rotisserie chicken mukbang video was taken down was because they made an inquiry to YouTube regarding that video, thus putting it on Youtube's radar. It has lead Zachary to believe that this inquiry into whether or not Amber's videos violate Youtube's TOS might be why we're seeing so many deleted videos.
Edit: oops ninja'd