I know of a similar case, the employee in question had to go through a similar process of questioning and audits just because they switched from FAANG A to B and somehow their manager came to know about it.

After that incident, many members left the team for other companies; they’ve been careful to not update their LinkedIn page with the actual company that they’re working for. When asked, they often said that they were working for a small time firm, and declined to name which one it was. As for their manager, they often claimed that they were taking a career break or would be pursuing higher education.