To some degree, I feel there are a varying set of reasons why people have settled on React - some were never fans of AngularJS/Angular and some disliked how Google handled the migration story from AngularJS to Angular are probably the strongest reasons. TypeScript also not being terribly FP friendly is also a huge negative to some, whereas React enables more functional patterns overall. Some also dislike separate HTML templates vs. HTML in JS templating, some prefer to cobble together a bunch of small modules together, even if the modules are weaker on average.
Ultimately, I think Google fell short on DX with the change over to Angular 2+ and the damage has lived on since, which is a shame because as a framework it was built really solid.