These downloads almost always come from pirated sources. You’re not paying the creators, and you risk copyright infringement notices (depending on your country) or exposing your device to security risks from untrusted file hosts.
It is important to note that many sites offering "150MB movie downloads" are often associated with: iProVPN: Fast & Secure VPN - App Store 150mb Mkv Movies Download
To minimize these risks:
: Tinny or muffled sound due to low bitrate encoding. These downloads almost always come from pirated sources