Because these tools must be downloaded from unofficial, unverified websites, they are frequently bundled with viruses, ransomware, or spyware . Antivirus software like Windows Defender will typically flag "AutoKMS" as a threat because of its intrusive nature.
A background service that periodically refreshes the 180-day KMS activation period to make it "permanent".
Using such tools is illegal and violates Microsoft’s Terms of Service. It is considered software piracy.