Are you talking about this part?
> if Facebook or any of its subsidiaries or corporate affiliates files a lawsuit alleging patent infringement against you in the first instance, and you respond by filing a patent infringement counterclaim in that lawsuit against that party that is unrelated to the Software, the license granted hereunder will not terminate under section (i) of this paragraph due to such counterclaim
And, please, point in which part of the file you linked where is said that your license is terminated if Facebook sues you
Re:Facebook React.js License
by arcticbull on Wednesday October 12, 2016 @10:33AM
(#12693175)
[edit] ugh, meant to put this elsewhere, rough morning.
If you read it, it doesn't seem like GP's claim is completely true.