How Safe is the Microsoft Office LTSC Professional Plus 2021 Activation Key?

I found a website offering a Microsoft Office LTSC Professional Plus 2021 activation key for free, and I’m wondering if it’s safe to use. While it’s tempting to get a free activation key, I’m concerned about security issues or potential malware. Has anyone used this key for activation, and was it safe to use?

Here’s the link to the guide: Microsoft Office LTSC Professional Plus 2021 Activation Key. Is this a safe method, or should I consider purchasing the software instead?