When I consider watching a movie, one of the first things I do is read a complete plot summary, including the ending. When I do this and no longer want to watch the movie, in my mind, that’s not a sign that any experience was spoiled, but rather that it just wasn’t very interesting to begin with.
Conversely, I have played Nethack on and off for decades, have read countless spoilers about it, yet still haven’t won and still find it interesting.
Many films are meant to be experienced, not just read or watched. Otherwise what's the point of a movie when you can just read a screen play? Or what's the point of a screen play when you can just read a synopsis?
2) If you want to avoid spoilers, you should probably avoid discussion threads about the subject, because people will often discuss their experiences in such threads
I watched Million Dollar Baby for the first time a year or two ago. I thought it was just a boxing movie, something like rocky or something.
I don't think reading the synopsis would have affected me like that movie did. I thought about it for days afterwards.