Comment by Scaevolus

Almost all of Facebook's "open source" code has the same PATENTS file, which makes them toxic if you can imagine a future where Facebook infringes one of your patents: https://github.com/search?p=5&q=org%3Afacebook+filename%3APA...

This includes things far outside the React ecosystem:

    - Flow (JS type checker, like TypeScript)
    - prepack (JS optimizing transpiler)
    - a bunch of Android/iOS UI/debugging frameworks,
    - all their GraphQL libraries (server/client)
    - their machine learning work (mostly targeting Torch)
    - Reason (statically typed programming language that transpiles to JS/OCaml)
    - ZSTD, a highly competitive compression algorithm.

Disclaimer: I work at Google on Kubernetes (which is Apache licensed). This is my personal opinion. I am frustrated with software with trivially incompatible licenses.