Clicking on a "Download Now" or "Play" button often triggers a download of a .exe or .apk file disguised as a video player. This can install keyloggers (which steal passwords), cryptocurrency miners (which hijack your CPU), or ransomware (which locks your files until you pay).
For pure safety and surprising quality, Tubi (US/Canada) and MX Player (India) are excellent. YouTube’s free movie section also has a growing library of ad-supported HD films. hd movieareacom