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Re:Explaining React's license by jaredklewis on Saturday August 19, 2017 @11:00AM (#15053742)
But you can still sue Facebook. Nowhere does the PATENTS file require grantees to waive their right to sue. But if you do sue, Facebook gains the right to counter-sue you with any react related patents.

I.e. the exact situation you would be in if you sued Facebook and there was no PATENTS file.

Re:Explaining React's license by falcolas on Saturday August 19, 2017 @01:49PM (#15054619)
Not quite - if there was no patents file, the BSD license would have a implied grant associated with it which would not be revoked by the lawsuit.

The "implied" license doesn't have a strong legal finding backing it up yet. Even so, most lawyers are comfortable with the idea that if a company tells other people to freely use their software, they can't then come back around and sue those same people.