Guessing by his profile: a Football Live Scores app that has 100k+ reviews in the play store - a very conservative estimate would put it at 3-5m users. It seems to have been plastered with ads which, safe to assume, are the source of that revenue.
Yeah it’s a really nice niche. Other niche ideas like this:
- Music Tuners
- Rulers/ measurement tools
- Tools using gyroscope (record speed indicator)
Take a simple idea and continue developing it until the user experience is really enjoyable. Not guaranteed to succeed, but a compelling way to spend your time.
I don't think that a football score app is niche at all - it's quite a saturated market with lots of competition. Fotmob seems to be the most popular one at least with the users of /r/soccer.
