React.js Terms of Usage

I've read a few articles that state if you use React.js you can't sue Facebook. I'm not planning on suing Facebook, but I am concerned with spending time mastering the framework if my future employers cannot effectively protect their intellectual property. For example, if I work for chat app called "Snipchat" with React and Facebook decides they want to copy the codebase without compensating my employer Snipchat would have no legal recourse. This concerns me because I want to be building skills I can market to employers and if employers decide React is too much of a liability then I should probably focus on Angular or Ember. I was wondering if the community could help me understand if I'm missing something. Are similar terms of use part of other frameworks (Angular/Ember)? Thanks!

Justin

Here's the article I read https://thenextweb.com/dd/2017/09/19/should-developers-be-afraid-of-zuckerbergs-bearing-gifts/#.tnw_WdANlKCY

Here's the excerpt from Facebook's term of use: “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. […] A “Patent Assertion” is any lawsuit or other action alleging direct, indirect, or contributory infringement or inducement to infringe any patent, including a cross-claim or counterclaim.”