There is already a fitting request in existence: Custom URL for movie/TV series trailers
However, the chances of it getting implemented are not good. Because Youtube doesn’t give away anything for free. Everybody should know by now that the user of Youtube is paying for his use of the service by a) watching ads b) giving away his usage data to Google.
All of the media which are currently availble through Plex, even if they are just trailers, are properly licensed. With contracts and all.
It is out of the question to “just do it anyway” without a contractual basis to agreeable conditions.
