OpenAI is hardly a monopolist, and the way it's shaping up so far LLM-based search is being provided by 3rd-parties like DuckDuckGo offering multiple models to choose from.
It is because OpenAI is a competitor for Google search, not because OAI is also a monopoly. YC has a conflict of interest because of their relation to OpenAI(YC research) and Sam Altman directly.
YC doesn’t after all often amicus briefs in court, the relationship was a definitely a factor in doing so. Stating that relationship clearly and disclosing financial upside they may get in the soon to be for profit conversion is relevant to this case.
The google decision could have implications for OpenAI’s business and therefore their enterprise value .
Apple Intelligence is another example integrating (intending to anyway) a variety of services you can choose between. Cursor as well. It actually feels like the ability to easily switch between rival models is a pretty standard feature of 3rd party services. And right now it feels like nobody is trying to stop this!