Setlist exists because my band lost a gig to a group chat. Three bands, one venue, zero coordination. Now 310 euros MRR from bands paying 8 euros a month to never lose a gig to chaos again.
Solo-dev mobile reality: release trains matter more than features (every second Tuesday, small), TestFlight/Play testing tracks are your QA team (12 bands test everything, they find everything), and the cat contributes by sitting on the keyboard during builds, which counts as chaos testing.
Question: how do you get bands to pay? Answer: the drummer pays. It is always the drummer. Something about keeping time and keeping calendars.