I think the argument is that Facebook is spending an absurd amount of money on engineering. So, anything that emerges as something that huge pool of engineers

I think the argument is that Facebook is spending an absurd amount of money on engineering. So, anything that emerges as something that huge pool of engineers find useful and cool is probably pretty well made. On the other hand. I do think you are right. React suffers from this a lot. React is good. It has a lot of strong competition from smaller groups. But, the attitude seems to be "FB will rub so much money against React! That much money and fame will polish anything. Soon it'll be popular because it's popular. Don't fight it."