The "best" 300MB file isn't about 4K HDR quality. It is about achieving a balance. Typically, these files are encoded using x265 (HEVC) codec rather than the older x264. The HEVC codec can retain decent 480p or 720p resolution at half the bitrate. The "best" releases on DownloadHub4u usually offer:
Some Telegram bots scrape public domain or Creative Commons content. Search for "Public Domain Movie Bot" rather than pirate hubs. downloadhub4u 300mb best
While the appeal of free, small-sized movies is obvious, it is crucial to understand the risks associated with third-party piracy websites: The "best" 300MB file isn't about 4K HDR quality