This has led to a bizarre psychological standoff. Microsoft has the power to ban the get.activated.win domain instantly. They could patch the HWID loophole in a Tuesday update. They have done so in the past with similar tools.
Is it legal? No. Using it violates the Windows EULA (End User License Agreement). You will not get a legitimate license for your business.
But what exactly is this tool, and why does Microsoft—a trillion-dollar company—seem unable (or unwilling) to stop it? The most interesting thing about Massgrave isn't the piracy; it's the delivery. Unlike the old days of downloading a risky .exe file from a Russian forum, Massgrave operates via PowerShell .