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.
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.
Well, yes, but... its popularity is not completely accidental. It's good - even by today's standards, but certainly by the standards of the time.
I like that it's a framework with opinions vs React which is a "Library".
Vue is probably the only outsider of that age that stayed even somewhat relevant (really by just doing what Angular 1 did but correctly), Angular seems to have kinda survived in some niches but other than that I haven't heard of the other similarly aged frameworks in a long while.