The .exe files disguised as movies are rampant. Even the MP4 files can exploit vulnerabilities in outdated media players. The "Top" pages usually have the highest click-through rates, making them prime targets for hackers to inject malicious ads.
Platforms like Netflix and Amazon Prime Video have "Smart Downloads" features that allow you to choose "Data Saver" quality, which produces files similar in size to 300MB downloads. 7xmovies 300mb top