I think education is a very underexplored area for these live conversation models. Yes you can just use ChatGPT Live but that's freeform and unstructured, doesn't have a curriculum or can present supporting visuals, etc. On a grand scale if you can give children their own personal individual tutor rather than relying on group teaching alone, there could be a huge jump in successful education outcomes.
Honestly though they need to hire whoever did those Google ads back in the day.
However, this open source project https://github.com/chatbotkit/platform/ does and you can plug OpenRouter or OpenAI keys straight in while keeping your integration work generic. The only downside is hosting it yourself but it is just docker compose up.
It baffles me that the labs can't come up with more exciting use cases for voice api.