is there anything to support this claim or...?
personally, i think it greatly fucks up the story. it's a nasty habit, turning to the last pages before even starting the book properly. -.-
There was a paper out in recent years I read the synopsis for that said spoilers are actually a new thing. Historically, nobody cared about knowing the end of things first and it never lowered enjoyment, but modern people have become addicted to surprises and twists. I wish I remembered the name of the paper to offer it but I don't, sorry.
If you want me to Google something real quick I can but in my experience there is tons of value in evaluating terrible adaptations (see WWZ etc.), discussing themes, ripping apart CGI over character development...the list goes on. For young reluctant readers it works as an incentive and reassurance when watching intense or scary movies. Having a heads up, rather than a spoiler can be beneficial.
The paradox is that we typically think we can only receive enjoyment if we come upon the story without knowing how the story goes. Yet we, contrary to our thinking, actually get just as much enjoyment while knowing the story as we do without. Like a time traveler going into the past knowing the future and with intent to change the future, except the changes they make do not affect the future. In this case the future represents our enjoyment.
So relevant for Infinity War. I had been spoiled beforehand that apparently many heroes died to Thanos in the original comics, so I was prepared for the worst with a grin on my face.
personally, i think it greatly fucks up the story. it's a nasty habit, turning to the last pages before even starting the book properly. -.-