The Real Lender on Your Mortgage Could Be the Federal Reserve

Bloomberg, July 1, 2021–Peter Coy
Why, again, is the Federal Reserve adding $40 billion a month to its holdings of mortgage-backed securities when the mortgage market does not seem to be in need of federal assistance?
https://www.bloomberg.com/news/articles/2021-07-01/the-real-lender-on-your-mortgage-could-be-the-federal-reserve?srnd=premium