High-quality files are generally larger. If a "1080p" movie is only 200MB, it is likely a lower-quality "CAM" rip or a fake file.
Common legal and safety risks
For a more secure and high-quality viewing experience, you might consider these authorized streaming services:
Because of this instability, the site can never maintain a "high quality" streaming infrastructure. They use cheap servers hosted in countries with no extradition treaties, leading to buffering, lag, and sudden shutdowns mid-movie.
Using compression techniques that maintain visual clarity while keeping file sizes manageable for mobile users.