To avoid automated copyright filters. If a file is named "Latest_Blockbuster_Movie.mp4," it gets flagged and deleted instantly. If it’s named a random string of gibberish, it stays up longer.
If you saw this as a "review," it’s possible you stumbled upon: 73L58B8S848GR84A8394CC.part4.rar
Sometimes people use public review sections on sites like Amazon or the App Store to pass "warez" (pirated software) links to one another in plain sight. To avoid automated copyright filters