for games, steam offers a trial of the game which can be refunded in full if you do it within two hours. It's a great feature for consumer protection imho.
I'd like to try a chapter or two of a book first, and if it doesn't grab, get a full refund. This is how you can prevent sinking time (and money, presumably) into a bad book.
Sometimes I make bad purchases, and that's just too bad.
It's gotten incredibly easy to put media out there, and it's great that people are able to tell the stories they want through the medium they want. At the risk of sounding like I'm just bootlicking, traditional outlets used to be able to filter out some of the more low-effort content and it was easier to expect that you were at least getting mediocre stuff. At this point, a lot of really low effort and low quality junk is in the ecosystem and it's harder to just buy something that looks cool.
Sometimes I read reviews for a restaurant, go, and come out thinking the other reviewers and I have a totally different take on things. It happens.
Same goes for movies, books, games, etc. I "do my research" and sometimes I'm wrong.
And sure, I absolutely sometimes feel "scammed" but to me that's just something that happens.
I'm not too bothered by the idea of demos (eg 2 free chapters), but I am a bit bothered by the idea of "I want a refund if I'm not satisfied enough".
I guess everyone would have a different threshold on what "satisfied enough" is.