Angular has been my main framework for the past 9 years, so I guess I can shed some light on this:

AngularJS came before React and being a Google product, gained enough inertia in large organizations that given the choice, the decision makers preferred to migrate to Angular 2+, which at the very least had a passing similarity to the previous iteration, instead of jumping to a wholly new framework like React.

The very last AngularJS to Angular 2+ migration I participated in happened in 2020, when it was already known that the former would reach end of life by the end of 2021. That is how reluctant corporations are to rewriting the entire frontend codebase.

Mind you, I've used other frameworks like Vue in an Angular-oriented company, but the project was: greenfield, small and underfunded, so we had some more liberty in choosing what to use.