Hey!
Interesting concept and a nice design. Intuitive and easy to navigate.
I've just created account and tried "eavesdropping", but there was no sound in the audio replies. Is this a bug, or is the product still in the demo mode?
In terms of the UX, I think the 'Sensei' tab could use a search bar. It would be also great if Sensei's profiles were clickable and had a collection of all their answers to the questions (maybe also a search option there, so that the replies are discoverable and monetisable in the long run).
For growth: referral link in the app that you can earn with?
Best of luck with the product!