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by Cyph0n 144 days ago
It depends. The most common reason is bitrate - the non-Netflix could have been ripped from another source (BD), or even from another service that has rights to the show in a different market (with higher bitrate).

The other trick some groups use is so-called hybrid releases. This involves combining video and audio from multiple sources to achieve the best possible quality. These are usually explicitly tagged as HYBRID, and afaik mostly applies to 4K remuxes.