I work for a bigger software company and our legal department has advised me to avoid using Facebook's react-native framework in any of our products, because of statements made in the second paragraph of Facebook's Additional Grant of Patent Rights Version 2 in react-native's PATENTS file:

The license granted hereunder will terminate, automatically and without notice,
if you (or any of your subsidiaries, corporate affiliates or agents) initiate
directly or indirectly, or take a direct financial interest in, any Patent
Assertion: (i) against Facebook or any of its subsidiaries or corporate
affiliates, (ii) against any party if such Patent Assertion arises in whole or
in part from any software, technology, product or service of Facebook or any of
its subsidiaries or corporate affiliates, or (iii) against any party relating
to the Software.

According to our legal department, the issue is that if our company initiated a patent claim or lawsuit against Facebook, then our license and right to use the framework would automatically terminate. This would apply if our company sued for any Facebook patent infringement (it’s not limited to the framework). Thus using react-native in any of our products would expose our company to risks we don't feel comfortable taking.

Please note that those concerns have also been raised by others (i.e. Google employees) and have unfortunately not been resolved by updating PATENTS to version 2 as suggested by #402 .

Thank you for reconsidering the second paragraph of Facebook's Additional Grant of Patent Rights Version 2 in react-native's PATENTS file.

I would love to move forward and recommend choosing react-native for one of our future products.
At this point I cannot do that.