Windows 10's “Controlled Folder Access” Anti-Ransomware Feature Is Now Live
bleepingcomputer.com
bleepingcomputer.com
If you can get someone to believe some random, Indian accented fellow calling saying they're from Microsoft and would the person please give them full remote access to the computer then it's child's play to get them to disable any optional, controllable feature in order to allow malware to spread.
And since CFA only protect user files the malware can still infect and block access to Windows and most people would then believe ALL their files were locked down rather than just Windows system files.
I guess for enterprise folks that can deploy via AD this might offer a bit of security although it's not clear if CFA can protect network files which of course would be just a vulnerable to malware when the attacked user have read/write privs in network directories.