This sounds like the inevitable slow death of RN to me. Web developers simply moving on to new tech that's better/more common on the web while RN languishes as the massive set of open source libraries required are abandoned
I have worked across these frameworks and React is the only one where I find the lib ecosystem satisfiyingly large (and still growing most steadily).
[1] https://npmtrends.com/@angular/core-vs-react-vs-solid-js-vs-...