Piracy sites are notorious for malicious pop-ups and "redirects." Clicking a download button can often trigger the installation of malware, ransomware, or even crypto-mining scripts on your device.
The core appeal of and similar platforms is their "300MB" category. These files use advanced compression techniques (like x264 or x265 HEVC) to shrink a standard 1.5GB or 2GB movie down to 300MB while attempting to maintain watchable 720p or 480p resolution.
By using modern codecs, these sites provide "exclusive" versions of movies that are optimized for mobile viewing or for users with limited internet bandwidth.