Why specifically 300MB? The answer lies in data economics.
You don’t need to risk malware or legal action. There are legitimate platforms offering compressed, low-bandwidth movies, often for free or very low cost.
9xmoviescom excels at offering not just Hollywood and Bollywood, but also dubbed versions in Hindi, Tamil, Telugu, Malayalam, and Bengali. A 300MB dubbed action movie from Marvel or a South Indian blockbuster is a major draw for non-English audiences.