Over 60% of "highly compressed" software files on torrent sites and file-sharing forums contain hidden payloads. Once you run the installer as administrator (which you must do to "install Office"), the malware encrypts your hard drive or uses your GPU to mine cryptocurrency.
In the digital age, storage space and bandwidth are often at a premium. It’s no surprise that millions of users search for the perfect loophole: a fully functional, modern version of Microsoft Office that takes up less space than a smartphone screenshot. The search query is one of the most popular (and controversial) long-tail keywords in the software niche.
: Many of these downloads are simply "download managers" that bombard you with ads or try to install unwanted browser extensions. 2. Official System Requirements