The twitterati and hobbyist crowd seem to love react, but anecdotally I've yet to see it used seriously at a BigCo, but Ng+TS is everywhere.
I'm wondering if there's a scraper out there crawling Alexa TOP 1xxx pages for use of specific libraries, frameworks? Maybe that would present a more accurate picture about this.
Also it's often misleading since in any company with more than a few employees there seems to be more than one team of developers which often leads to different frameworks being used in different parts of the company. In $dayJob we use Angular in some legacy internal stuff, React in a rewritten consumer-facing project and preact or jQuery in a different consumer-facing project.
It's not that simple to determine marketshare of frameworks I think. We can just present different numbers and draw different conclusions from it, e.g. number of job postings mentioning specific frameworks, number of downloads in a registry, number of domains using it (assuming one app per domain), number of stars on github or number of people claiming to use it in the stackoverflow survey.
Not everything is public facing though, particularly in enterprise