Available to Insiders now. https://www.bit-tech.net/news/microsoft-previews-new-ransomware-protection-feature/1/
So this gives them a tool to also lock down W10 even more against the user attempting to keep control of his own system. Isn't it convenient.. Makes you fleetingly wonder who REALLY released that new ransomware, which was as dysfunctional as a MS bit of software I hear (in that it could not even decrypt if you were to pay the offender).