I look at them. If they are ten pages of 'How the Gods made the world' info dump with huge chunks of tell - I skip them. My favourite book has a prologue similar to this, which I read once, and have never read on the re-readings because, well I think it was unnecessary.
However if it's an actual
scene, then I read it, provided it hooks me. Because whereas a huge chunk of backstory you can live without, a scene may well be very pertinent to the story. Like mine
And why isn't it chapter one? Because it's from the viewpoint of someone who isn't the POV character, and she doesn't know anything about it so I can't show it any other way, it happened several thousand years before, plus it kinda sets the tone for the book. Anyone skips it, the climax will make less sense. *shrug* not a lot I can do about that.
So it depends. If it works, if it's action,
pertinent action, do it. If it's backstory, dump it. If your reader wants to skip it, their priviledge. They might miss out, but that's their problem