https://www.heise.de/en/news/Steam-Payment-providers-force-V...

Please explain.

"In 2020, following a complaint from the Hamburg/Schleswig-Holstein Media Authority, Valve blocked all titles that were labeled as “adult” and did not have an age rating. To be able to offer them, the US company would have to integrate a reliable age verification system into Steam in Germany. Because Valve has not yet implemented such a system, sex games remain blocked in Germany. "