Zstd is a personal project? Surely it's not by accident in the Facebook GitHub organization? And that you need to sign a contract on code.facebook.com before they'll consider merging any contributions? That seems like an odd claim, unless it used to be a personal project and Facebook took it over
All Google dev’s personal projects are under the Google account on GH for legal reasons. I assume the same for Facebook. I believe fb championed zstd and lets the dev work on it at work but it was a personal project iirc.
