Some of this is going into the background of interview videos to back up the claims people make of having worked at places that no longer exist and can't be verified.
This is what's currently happening with Twitter (since they laid off the entirety of HR).
As an ex-Twitter employee who started a new job at the start of the year, I can confirm that they did not respond to inquiries from the company that performed my background check. There was some back-and-forth with the recruiter at my new gig about it, until I reminded him that the reason my boss recommended me was because I worked with him at Twitter.