I added my websites to Google Index with help Google Indexing API. But they stopped being added at about Oct. 21. I found the news about "Request Indexing Feature": https://www.techradar.com/news/google-killed-one-of-its-most-popular-seo-features-ahead-of-black-friday But it's function in Search Console (it's irrelevant to Google Indexing API). Or Was it turned off too? Do you work with Google Indexing API? Does it work with your websites now?
I saw the tweet. But I don't believe connection of two events. I am using function 4 month, and there were no problems (Although the rules of using were before). Are you using Google Indexing API?