That may be the case for React, but the vast majority of your stack (e.g. react-router, react-redux, styled-components, etc) certainly don't have millions of dollars being poured into them. The base frameworks are very very similar in terms of what types of features they provide.
Both Dan Abramov and Andrew Clark (co-creators of Redux) were indeed hired by Facebook to work on the React core.
However, Dan and Andrew haven't actively touched Redux library code since mid-2016. (Dan occasionally drops into an issue to comment, like his suggestion to not ship a `useActions` hook for React-Redux, but that's it.
The _current_ maintainers (Tim Dorr and myself) do not work for Facebook, and Redux has never been a Facebook-sponsored project. We're an independent open source project.
We chat with the React team frequently via Github and Twitter and such, but that's just OSS collaboration work.
