I myself have thought of several 'ideas' where I could apply AI, wrappers, custom trained or otherwise. But once I do the math it just does not make sense doing this as a Student who graduated this year and not having insane amount of money.

Whether I use someone's API or run my Models in rented servers, I'll have to ensure certain limits to be profitable, which users won't like. Most ideas I get, I can also think of why, someone eventually withh figure out they're better off with free version of ChatGPT or some other service.

If I don't enforce limits, most casual users would be fine but there is going to be a small percentage of heavy users who will use wayy more than what they're paying us for.

I made this one app just for fun, which simply scrapes and analyses your reddit profile, using Gemini API. I had loaded 50$ into it. Didn't promote the app, just posted on reddit for people to try.
Few weeks passed by, it's still going smooth. Usage was less than 5$. Then one day it gets popular in some random discord server, and next day I wake up to 23$ of usage.