Using activation exploits can interfere with Windows Updates. If Microsoft identifies an exploit vector, they may release a security patch that disables the activation method, potentially leaving the user with a "black screen" or persistent "This copy of Windows is not genuine" watermarks.
Most "keys" found in GitHub Gists are rather than valid activation licenses. These allow you to install the OS but will not remove the "Activate Windows" watermark or unlock full features. Review: Windows 8.1 Keys from GitHub windows 81 product key github verified
: If your device originally came with Windows 8.1, the product key is often embedded in the BIOS/UEFI firmware or located on a sticker on the device. Using activation exploits can interfere with Windows Updates
Malicious actors can embed code that downloads a RAT, giving them full control over your PC. They can steal passwords, banking details, and personal files. These allow you to install the OS but
If you cannot afford a key, Microsoft allows you to install and use Windows 8.1 indefinitely without activation. The only limitations:
Many "activator" scripts on GitHub contain malware or trojans.