I'm not sure about releases before the theaters, but it definitely happens before streaming. For example, a Russian WebRip of Project Hail Mary with the original English audio overlaid was released on public trackers today, and I am already at a 12:1 seed-to-leech ratio.

So, that is about a month ahead of when it may come to Amazon.

Death Stranding 2 had a scene release before the official release less than a month ago. IIRC a few videogames, usually the AAA titles, offer preloaded files on Steam to those who pre-ordered it. The files come encrypted and get unencrypted on launch day. I'm not sure how many times it happened, but do it can happen, like it happened to Death Stranding 2, that some mistake happens and the unencrypted files are served instead.