Unlike the HD thumbnails promised, many "high quality" uploads are actually:
Many "download" buttons on these sites do not lead to a movie file. Instead, they download a .exe (executable) file disguised as a video. Once run, this can install keyloggers (to steal passwords), trojans, or ransomware that locks your files until you pay a ransom. 9xmoviesgurucom
You might block one site, but three clones appear. Why? Unlike the HD thumbnails promised, many "high quality"