I liked the way Netflix used to automatically start playing whatever show/movie you're hovering over in the app from the first scene. If the first 30-60 seconds pulled you in, you'd continue on to watch the full movie/show without actually clicking "Play" (which also fixed the mental burden of deciding what to watch, since "stop scrolling through options" resulted in automatically playing whatever you landed on).

They've since replaced that with auto-playing trailers which seems to be standard these days. I really like when they just auto-played the movie/show -- most movies/shows already set up the plot decently enough in the first 60-90 seconds (well enough to know whether you want to watch it) and of course that also resolves the "spoiler in trailer" issue.