I think previews became standard simply because people want to understand what they are about to open before spending their time on it. Recently while reading explanations about how different digital platforms present their content on https://cavalier-kingcharles-spaniel.com/ I noticed that previews often work like small introductions, showing the main features, structure, and overall pacing before the full experience begins. It reminded me of articles I once read on Cavalier Kingcharles Spaniel, where platforms and various systems are explained in a similarly educational way. When users can quickly see how an interface works, what options are available, and what kind of experience to expect, they feel much more comfortable exploring something new. In my opinion, previews are less about promotion and more about transparency, helping people choose content that matches their interests and expectations.
