Many heavy hitting tech companies have developers using and exploring it, mainly because it augments rather than replaces. It's very easy to add validation while not changing anything else. Lots of users around Kubernetes applications.

Didn't realize people still used Wikipedia for things besides for "facts" since its descent into the political / opinion battlegrounds. It's been years since I used it

Again, who's actually using it? All I see is Salesforce and two no name companies. It's supported by Netlify which is something, but I wouldn't say "hard hitting companies". Netflix and Amazon are hard hitting.

If it doesn't have a Wikipedia article, there's a very good chance it isn't very popular in the industry. At least in terms of open source standard technology, which this appears to be reaching for.

Google, Amazon, Tesla, Tencent, Alibaba, ByteDance are in the list, not all are on a website. It's not like a company mandate, mainly individual contributors checking it out and building things.

It's not widespread because it is just starting to get going, but it is definitely popular (well liked) among its users.