Starting in September, Steam will undergo significant changes that will ensure that graphic thumbnails will no longer be cluttered with unnecessary additional information.
Valve has announced upcoming changes to Steam's rules to make game thumbnails in the store more readable.
As of September 1, graphic thumbnails (i.e., small images with a game's logo displayed when browsing, for example, the website's news or sales list) will not be allowed to include:
Game developers will still be able to place information about updates and events, but this will only be possible in temporary graphics, not those assigned to a game permanently.

Valve motivates its decision as follows:
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Author: Adrian Werner
A true veteran of the Gamepressure newsroom, writing continuously since 2009 and still not having enough. He caught the gaming bug thanks to playing on his friend's ZX Spectrum. Then he switched to his own Commodore 64, and after a short adventure with 16-bit consoles, he forever entrusted his heart to PC games. A fan of niche productions, especially adventure games, RPGs and games of the immersive sim genre, as well as a mod enthusiast. Apart from games, he devourers stories in every form - books, series, movies, and comics.