Searching for "Netflix AltStore" is a waste of time and a risk to your security. The combination of Netflix’s DRM, server-side validation, and Apple’s code signing requirements make it virtually impossible to sideload a working Netflix client that streams for free.
The story of Netflix on AltStore isn't one of official partnership, but of a technical workaround in the "cat-and-mouse" game between third-party developers and Apple’s ecosystem. The Technical "Backdoor" netflix altstore