it's because the trailer has been stored in the servers for months.
full movies are never stored the same way because of a piracy risk and it would bloat the space.
so they stream the movies to you slowly.
the quality degrades because it's streaming the film while playing it to you and buffering in the background.
Why are you passing off false info?
The trailers being stored on the servers is irrelevant. Movies that were released years ago, have poor picture quality than these high quality trailers that were just released a month ago.
Space is not an issue, we are talking about Google who owns YouTube where YouTubers are uploading 4K videos everyday.
I highly doubt that providing a high quality picture would increase piracy risk. I don't understand your logic.
Netflix, Disney+, Hulu and all other streaming service are all using the streaming method yet provides a better picture despite using a subscription base model. How does an ala carte, pay per view method produce a shyttier picture vs the millions subscriptions viewage?
I'm not familiar with your username. I hope you're just trolling.