mousiopebut valve letting racism remarks slide in their games it would bring a far more negative publicity and force them no fix the game since we all know they dont give a fuck about the cheating part
It's well known that Valve makes most of its money from the Steam Store, and is also a private comany. This insulates them from a lot of motivation to do anything the public wants. Comparison example: You can be sexist in any CS lobby, but be banned in any Riot game.
Some other strategies might be needed. I watched Uncle Dane's FixTF2 video, which has an appeal to ego (asking Robin Walker if botopia is the legacy he wants to leave), which I think is a nice approach that might not have been explored yet.
Edit: Additionally, I will say that also in the video, it is said that cheating is an industry wide problem. The task of solving the bot crisis is not trivial at all, and it's not completely true to say that Valve has done nothing to try. I think that the sentiment that Valve "just needs to do X" is pretty optimistic. When we ask for the bot crisis to be solved, we are asking for a lot.