You're mistaken. If you'd like to estimate how much apps are making, check https://app.sensortower.com/ (it's pretty accurate), you're going to be very surprised with the number of apps making > $5k/month.
Personally when I think of apps I think of one-time purchases. Good on him for finding 2k+ people willing to pay $5/mo for a pomodoro timer but this seems much closer to SaaS than app to me.
