The GitHub org is required to for sure, with a very similar mandate to the one Shopify's CEO put out.
LLM use is now part of the annual review process, its self reported if I'm not mistaken but at least at Microsoft they would have plenty of data to know how often you use the tools.
From reading around on Hacker News and Reddit, it seems like half of commentators say what you say, and the other half says "I work at Microsoft/know someone who works at Microsoft, and our/their manager just said we have to use AI", someone mentioned being put on PIP for not "leveraging AI" as well.
I guess maybe different teams have different requirements/workflows?
Similar to google. MS now requires devs to use ai