Many "300mb" sites are notorious for malicious pop-ups and "update loop" bugs that can infect devices with ransomware.
The "UPD" in the keyword likely stands for or Update , signaling a fresh batch of film releases or a new working domain for the site.
This is a hallmark of "mobile-friendly" piracy sites. By using HEVC (x265) compression, these sites can shrink a 1080p movie down to roughly 300MB without making it unwatchable on smaller screens.
Cybersecurity auditors like Scamadviser often give these domains a trust score under 20%, citing high risks of phishing and scams.