They author thousands of open-source. Nobody would consider those 'products' (though feel free to play pedantic). And many would argue React did far more harm than good.
We would still have a framework of the week like we do today. There was a new framework weekly before React and there are frameworks of the week after React. React just gave us one more way of showing text on a screen.
Maybe I'm exaggerating slightly, but I think we should judge frameworks compared to what other things existed at the time.
It's, by the way, another example of how the only good thing Facebook did was deny Google complete dominance.