Great question — answering as the UphillTech team:
They don't. The film or series is wholly owned by Netflix after production if it's a Netflix Original, or has had its licence purchased at a flat cost for a fixed period of time and may be renewed in future if it's popular. Netflix apparently usually pay upfront for at least two seasons of a netflix original show, and have a business model comparable to more conventional subscription TV (like Cable) when dealing with series' that aren't Netflix Originals. That is, they buy the right to "air" it for a period of time. In some cases maybe a netflix original film would be cinema suitable, but the series' likely would not, and by limiting the shows to their own platform they provide content that...
Full answer by Ruadhan2300: https://movies.stackexchange.com/a/89562 (CC BY-SA 4.0).
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