I’m fully aware, I grew up the the game as well (well, TF2, but it was the “golden years” of Valve and source-based multiplayer games). That doesn’t mean Garry Newman can’t send them a copy of the dmca for them to include in their C&D. I honestly want to see Valve do it, regardless of whether the original dmca is legit, because it’d bring a lot of attention to false-dmcas. The reason why I’m not saying that Garry should do it is because, well, the assets are actually Valve’s, not Garry’s, and I’m not sure if Garry actually has an explicit license to use them and as such, would not be in a position to “fight fire with fire” himself.