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most people will probably be adding it to a dirty chain and then it'll do 3/8ths of fuck all?
Well, maybe more like 1/8th of what could be achieved by coating the parts before assembly.
If you get the chain clean (multiple passes through the ultrasonic in a solvent, then bake out any residue) and then vacuum impregnate with the WS2 colloid, you might be getting somewhere, but a tiny little bottle isn't going to do it, you need to immerse the chain.
So most people will probably be adding it to a dirty chain and then it'll do 3/8ths of fuck all?