The question seems rhetorical but I think there are two reasons in some combination. First is it there is some awareness lag here. That lag can be on the producer and consumer side. Software enterprises are pretty slow to adopt new things and slow to try new things so they might only be aware of openai and Claude as options. Plus there are some scariness because deep seek is a Chinese model and therefore export restricted - never mind that there are American in European providers.

The other reason is more interesting. Maybe the frontier providers think that price performance is irrelevant in light of very powerful frontier models that can start the RSI loop and or a huge displacement of work and a winner take all economic situation. After all if frontier providers earn everyone's money then you won't have any money to spend on any model 100x cheaper or not.