Not just that. Facebook uses it for their flagship website (and as React Native for their mobile apps). So does Instagram. So does Netflix. If you have the React developer tools installed you can literally go to facebook.com or netflix.com and see them using React.
Angular in turn can't really namedrop use cases like these. Yes, Google uses it somewhere in their ad manager, YouTube uses it in their video manager, Amazon uses it for something -- these are big names too, but the use cases aren't nearly as impressive and they're not as integral to the relative companies' core business. Google (who is backing Angular) doesn't have nearly as much skin in the game as Facebook (who is backing React).
The difference between React and FRP in turn is that React simply builds on well-understood ideas that already exist in mainstream front-end programming: modular components and one-way data flow. You don't need a CS degree to understand the benefits of having your views not directly manipulate your state.
FRP isn't bad. It's just that React is good enough, which is what really matters at the end of the day.