Platforms like HBO Max buy content from third party providers in order to have access to a variety of content that their own production cannot provide. This allows them to expand their library and offer viewers more options in terms of genre, language and target audience. Purchasing content from external sources reduces the need for original programming, as well as costs associated with creating and marketing original content.

Additionally, licensing existing media can be less risky than investing in something new, allowing platforms to acquire high quality content with minimal risk. Third-party providers also help streaming services build relationships with other studios and networks which can be beneficial for both parties in the long run. Overall, by buying content from outside sources, streaming services are able to diversify their collection while providing users access to a wide range of films and TV shows without having to rely solely on self-produced productions.