Which streaming platform first implemented the collaborative filtering recommendation system that revolutionized personalized content discovery in the film and television industry?

The entertainment industry has been revolutionized by streaming platforms, with each service developing unique marketing approaches to attract and retain subscribers. Their digital transformation strategies often include sophisticated recommendation systems that analyze viewing habits to suggest content. How well do you know the algorithms behind what appears on your screen?

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Netflix, with its Cinematch algorithm in 2000 that was later enhanced through the Netflix Prize competition
Amazon Prime Video, with its ItemCF system originally developed for its retail store in 1998
Hulu, with its ViewerConnect system launched in 2007 specifically for episodic television
HBO (pre-HBO Max), with its CineSelect algorithm developed with Warner Bros. in 2005