evolution of windows: useful -> adware -> spyware -> tech-support-scam (this story) -> ransomware (automatic full disk encryption is said to be deployed soon)
Automatic full disk encryption, with the encryption key stored at Microsoft, has been a standard "feature" for non-local/domain accounts for many years:
Microsoft may have your encryption key; here’s how to take it back https://arstechnica.com/information-technology/2015/12/micro...