This is not TRUE, if you went on to watch the complete video (not available now) , you would actually realize that he did not want people to spoil the open-source rather he wanted people to join and make Quality pull requests. He wanted to keep the video short and informative and hence he made such a P.R. (he also asks people to not to make FAKE P.R. and requests them to deliver quality content) . It depends on the viewers whether they deliver right content or not. To be honest, I am 13 y/o and I did not know anything about Hacktoberfest. It was Harry's useful video which helped me to know about Hacktoberfest. I greatly thank Harry for the same. After knowing what Hacktoberfest is, I submitted 6 Pull Requests (not FAKE)