First, we are updating the Content Survey that developers fill out when submitting to Steam. The survey now includes a new AI disclosure section, where you'll need to describe how you are using AI in the development and execution of your game.

https://store.steampowered.com/news/group/4145017/view/3862463747997849618

But Valve has never been one for actually moderating their store or forums, that would require actual investment of both money and time.
I wonder if this will finally make them act.