A typical 90‑minute movie, even at 480p, requires roughly 300–700 MB using efficient codecs like H.265. Shrinking a movie to 10 MB means compressing the original data by a factor of 30–70×. To achieve that, encoders must:

You don't get a movie. You get a cryptocurrency miner that slows your PC, ransomware that locks your files, or a keylogger that steals your passwords.