I always find this very frustrating, how hard can it be to put a demo (or even just a screenshot) of your product? Did they not think someone visiting their site would want it?

On this note, the worst offender in my opinion is Voyager for Laravel [1], where the "play" button has been put over a screenshot of the product, but when you click on it there's a 90 second video of a guy talking about the product. So. frustrating.

[1] https://voyager.devdojo.com/