Well i think anyone who genuinely does not want to be spoiled would have decided to not search for Alien Covenant related stuff or visited sites like this no soon as the 2nd Trailer Hit.
People should be aware that visiting sites can potentially give a bit a way, and also that TV Spots could do too.
THEY (Fox and Ridley) have spoiled this movie more than Prometheus they have released more information, we have had reports that are Officially allowed to be reported (so no FOX take down requests).
And so the only way to not be Spoiled is to keep away and not look on the internet...
This is why Michelle has disappeared as she wants to go into the Movie with as little known as possible and i think she is even staying clear of the Trailers.
Some trailers nowadays do always seem to give a lot away in terms of movies, some more than others and Alien Covenant is Guilty of that..
But people who genuinely want to go to the Movie as Spoiler Free as possible should know visiting any website like this would lead to some Spoilers.
The Best way to go in Blind would be to have only seen the First Trailer and then the Last Supper Prologue.
Unfortunately this site does not have a Spoiler Tag/Filter, and then its a case of people putting Spoiler in the Title of their Topics if they are covering stuff but then the GREY line is... is it really Spoiler if its disusing what has been shown Officially in Trailers, TV Spots or Officially Licensed Footage like the Empire Magazines.