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Many many threads on the topic on DJI versus non-OEM props. As recently as last week. Lots of great information there.
In summary:
Both types in inexpensive - DJI cost somewhat more of course. Nobody has reported consistent problems with the substitutes. Nobody has had warranty work denied due to knock offs but that's a theoretical concern. Must people who choose non-OEM do it for color choices or to save a few bucks. Anbee is as popular name but they all come out of a handful of factories and just get rebranded.
And...
Lots of folks wishing for a true low-key noise option (fake ads for them on Amazon but just same design with false description).