Highly compressed PS4 games usually refer to "repacks" or modified PKG files where redundant data (like multiple language tracks or high-resolution textures) has been removed or standard compression algorithms have been applied to the installation files. How PS4 Game Compression Works
Many "repack" sites hide miners in the installer. When you decompress 60GB of data, your CPU runs at 100%. A malicious repack uses that heat to mine Bitcoin. (FitGirl, Dodí, or scene groups like Opoisso893).