On July 7, Mozilla announced the results of a survey based on a report from YouTube users that they “regretted” watching the video. According to the report, 71% of the videos that people who participated in this survey “regret watching” in response to the recruitment of crowdsourcing were picked up by the “recommended” function by YouTube’s artificial intelligence (AI). It was. In addition, there were cases where the videos that YouTube recommended to watch were deleted afterwards because they violated the terms of the service, and the videos that responded that they regretted watching participated in the survey. It also turned out to be more popular on YouTube than videos that didn’t cause any backlash. In response, YouTube explained that users are happy with YouTube’s recommended videos, according to their own research, and generally showcase reliable and popular videos. In addition, Mozilla’s definition of the word “I regret watching” and the validity of the collected data cannot be properly verified on YouTube, and the past year to reduce the number of cases where harmful videos are recommended. He said he is constantly working on improving recommended features, such as making 30 changes. YouTube, a major video site under the umbrella of Google, is the world’s largest source of online video. The number of viewers per month exceeds 2 billion, and the total viewing time reaches 1 billion hours per day. For many years, YouTube has made it an advantage of its service that more than 70% of its users’ viewing time is accounted for by algorithmic recommendations. But Mozilla’s research suggests that some of these recommendations may be flawed. Approximately 9% of the recommended videos reported as “regretted watching” (189 videos in total in this survey) were later deleted from YouTube. YouTube videos may be deleted for a variety of reasons, including offensive and dangerous content rule violations and copyright infringement. There are also cases where the video is deleted by the poster. However, the survey found that some of the videos YouTube deleted due to policy violations were recommended by YouTube itself in the past. The survey also found that videos that users reported regretted watching tended to be more popular on YouTube. The videos reported by the survey participants were 70% more viewed per day than the other videos they watched. In addition, Mozilla’s research found that the categories with the most frequent reports of regrets were misinformation, violent or raw content, hate speech, and spam / scams. Also, looking at the percentage of YouTube videos that regret watching, 60% was higher in countries where English was not the first language than in countries where English was the first language, especially in Brazil, Germany and France. This article was edited by Asahi Interactive for Japan from an article from overseas Red Ventures.