This would be WONDERFUL with a Spanish-native accent as a language tutor, but as you've already got English you should try marketing this to the English-learning world. There is a huge dearth of native English speaker interaction in worldwide language instruction, and it's typically only available to the most privileged of students. Your system could democratize this so anyone with an affordable fee (say $10-20/month, subsidized for the poorest) could practice speaking and have their own personal tutor. The State Department and Defense Language Institute might love this as well as, if trained on languages like Iraqi Arabic and Korean would allow live-exercise training prior to deployment.

It can also function as an instructional tutor in a way that feels natural and interactive, as opposed to the clunkiness of ChatGPT. For instance, I asked it (in Spanish) to guide me through programming a REST API, and what frameworks I would use for that, and it was giving coherent and useful responses. Really the "secret sauce" that OpenAI needs to actually become integrated into everyday life.

I don't think the level of fidelity actually matters as much as authority or ability. What can the agent do that isn't accomplished by, for example, a landing page or an FAQ page? I've never encountered a (text) chatbot that did anything useful for me as a consumer, whether for sales or support.