I spent hundreds of hours on this, so there is still some friction.

If I told you the exact market and use case, I'd still have a decent head start, but indeed, someone without a job could invest more time than I do. People in a cheaper location can work for far cheaper than I can afford to.

With head start I don't meant that the idea is so novel that I need to keep it a secret. However, I believe that if there is an established app that does the same thing, and your app cannot beat it on quality, it will be hard to attract users.