To be fair it is a trailer to 61 episodes (1342 minutes) of a show and not a 2 hour movie, so a 3 minute trailer is not that bad.
I doubt anyone who sees this trailer and then decides to watch the show would look back at the trailer or remember details from it after the first 2-3 episodes.
I went to see Spider-Man 2 days ago, I saw the trailers before hand, a few minutes into the movie I was just focused on what was happening. I did not think once about “Wait the trailer spoiled this for me”
Also there is no context to many of the scenes in the trailer, the cuts are quick, only tiny amounts of dialogue.
That said I do not care at all about being spoiled as IMO until you see something as it happens (Ie actually watching it) you do not have all the context to the scene nor the music or dialogue. So that may explain why I do not see the trailer as spoiler-ish.
I guess we are getting slightly off topic.
With this show it is difficult to actually find someone who has seen it and given it a chance who does not like it. Beyond the type of person who watches it just to say, Everyone likes it, but I am not everyone so I hate it, lol