They dont have to be, they just have to be smart enough to remove anything that sounds like a brand from a "good cloud model". This is barely beyond if-else if we start tracking all brands doing the advertising
And for the rest, why not wait a few months until the cheap Chinese model is on par (or better)?
If OpenAI introduced ads to my workflow after all the money I've paid them, there's 0 loyalty or "ethically American" purchase decision vs paying the Chinese.