React's current market lead comes from being out earlier then its competitors, and support for native, but with release of flutter and vue native etc, things will change,
Angular and vue use typescript which is supported by Microsoft, which is now becoming more main stream,
the future of web application is moving to PWA, which is introduced by Google, I believe angular will be first to support it,
Facebook's properties are very much connected, say your personal account gets banned you lose access to your page, your business IG, your API etc,
I am an investor, facebook, the company behind react, its revenue consist of 99% ad, with push of privacy law and ad block and the company struggle to diversify out of APPs,
the level of support for the project might get affected, i know it is open source project but still...