Have you seen the same chain pattern outside finance yet? Wonder whether investment scams are the most conspicuous because the payout per convert is high or whether it's seeded the widest on YouTube specifically.
Happens a lot in meditation/spiritual videos on YouTube, spam promoting some AI-generated "manifest riches with the power of your mind" type book.
I saw something like this for a book. It was under an Instagram reel where the person was describing ways to improve your self-esteem. In the comments section someone mentioned a book that worked for them and it had a few replies saying how it worked for them too. I searched for the book and it was a very new book from an unknown author and zero reviews everywhere.