This happened to me. I was wondering why my internet speeds were slow when I discovered that Microsoft was in the process of uploading my users directory, they had already uploaded almost two gigs when I realized. They also changed the path to these directories to something like C:\Users\name\OneDrive\Desktop\. Another poster in this thread claimed it's easy to reverse -- I disagree, it's a pain in the ass to track down the setting, and I shouldn't have to do this. When I did, it gave me an error for one of the directories and refuses to revert (documents?).
I don't like leaving negative or hyperbolic comments on HN, but this was enraging and unacceptable to me. It's hard to convey without coming off as unhinged. I only ever boot into Windows nowadays when I need to compile and test a Windows build of software. I understand Microsoft has built up good will through efforts like VS Code, but it's all undone because of things like this. I avoid MS products, they cannot be trusted.