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YouTube is Google’s most successful video streaming platform. As a medium, it creates a low-cost and highly flexible personal channel. YouTubers are part of a popular emerging industry. Each YouTuber’s channel shows its characteristics. YouTubers occasionally collaborate with other YouTubers to shoot. Such a commercial cooperation is called a “Cameo (Feat)”. In this study, we explored the cameo effect of guest appearances using the promoter score (likes plus dislikes) and net promoter score (likes minus dislikes). We gathered data in the form of videos from the top 100 YouTubers. The results show that the number of views increased by 63.4%, the number of likes increased by 62.2%, the number of dislikes increased by 67.8%, and the number of comments increased by 36.0%. Overall, the promoter score increased by 62.4%, and the net promoter score increased by 61.9%.