If you order a pair of Prada shoes from a website, you get it, open the box, and it contains a pair of old converse...you've been scammed. If somebody says "hot assplay scene" with no preview, you buy the video, and it in fact does not contain assplay, they've scammed you. I'm sure you've seen the guys who not only don't put a preview, but they split it into two short clips so you can't see that the content is supershort and perhaps can't justify the price. The same people who say "Oh it's fine, they're great" are the same people who run into their DM's thinking they're gonna become friends.
Buying Onlyfans content shouldn't be like opening a surprise and you just "get what you get", if that's not what was advertised. Onlyfans deals with thousands of chargebacks because of this all the time and they warn people against it. But as I said, you're welcome to spend your money on whatever you want if the fake stuff gets you off. I'd rather give people a heads up so they know who they're dealing with and perhaps save them a few dollars that they could have used for something/someone else.