"The UX of the top streaming services are expertly designed to encourage me to binge and remain on the platform for as long as possible." -- I don't quite under

"The UX of the top streaming services are expertly designed to encourage me to binge and remain on the platform for as long as possible." -- I don't quite understand this. If it would be an advertisement-driven platform, like Facebook, then keeping people on a platform for as long as possible would certainly make sense. From a business perspective, that is. However, for subscription-based ad-free platforms like Netflix, I don't really see how it benefits them (assuming that people stay within the same plan/tier).