Stay safe, stream legally, and let your deewanapan (craziness) for good cinema win over piracy.
The Official Blu-ray remains the king of quality. It has a higher bitrate (40 Mbps) than any streaming service. While it is not 4K, the color depth and sharpness on a 4K TV via a Blu-ray player will crush any "fake 4K" download you find online.
Yes. Telegram files are almost always re-encoded 1080p files renamed to "4K" to get clicks. They also often carry spyware.