Your PC and your saved game files will thank you.
The most significant risk is security. Executable files (.exe) downloaded from unverified forums or Reddit threads can be laced with malware, keyloggers, or ransomware. Because the original Halo 2 PC port required a "crack" to bypass the Games for Windows Live DRM, many Google Drive uploads contain these modified executables. Unscrupulous uploaders often hide viruses inside these cracks.
The math is simple: