I do not understand why this is a big deal. There is no world in which ads are embedded in LLM answers, because you'd need another LLM to determine whether the "placement" was correct and included all the information that the advertiser wanted (and it still won't work 100%). They are putting ads on the side, like they've always done, leveraging all the tech that already exists to do this. This is pretty much a no-brainer for OpenAI and any AI company.