I'm gonna be pretty suspicious of any external party telling a company they don't work for that they have enough money to do x. None of us know what Valve's budgets, expenditures, other projects in the works, employee availability, employee expertise, etc they have. It's just not reflective of how large development organizations work. Not to say this wouldn't be worth Valve focusing on, but we just don't know enough about their finances to make that kind of call.

My brother in christ, if it was that easy it’d be done already

On paper all bots act the same? What does that even mean? Adding just a bit of randomness to the code, different hardware and the massive amount of permutations a 3D game offers and I'd like to see you try. First bots were really stupid, but with detection evolving so have the bots and cheats. There is one way to reliably get all of the cheaters: accept a lot of collateral, i.e. non cheaters getting banned.

I think all that will do is make the bot software work a bit harder to seem human. They only are so blantantly obvious now because there isn't any detection in place. It would be totally possible to improve the bots to bypass any detection algorithm. Just look at how easy captchas are to bypass.