Good point of the top of my head

Subscription model

Community funded learning

Transaction fee for withdrawing the sats

In app - sell educational ebook/resource/flashcards

I’m not sure how on the mark I am with this, but eventually when Bitcoin reaches its monetary premium and is the global money, people who accumulated a lot of bitcoin will be wanting to give their bitocin away in return for other goods/services.

If I had the funds I would do this app.

Anyway back to the drawing board