Listings on Steam cannot be filled exclusively with concept art and will instead need to include actual in-game images. As per a requirement that'll soon roll out, a game's image gallery must use screenshots, which may make it harder for publishers to hide the low-quality nature of their titles.

If a gallery is filled with written content or concept art, it's "harder for customers to understand" what they're buying, says Valve's Alden Kroll.

The requirement will go into effect when the Discovery Update 2.0 is released in the coming weeks.