I don't expect it to generate full time job level income, all I expect it not be a burden.

I used to make free apps, browser extensions and so on. Dropped everything because it becomes full time job and if its going to be a full time job I must be compensated accordingly.

I'm no longer a teenager and my time is no longer paid by my parents. It's possible to have other business models where the software is "free" but on this particular case I don't see how it can be. Transcribe all the user audio and share it with advertisers? Please no.