Earlier quoted context omitted.
What are the regular maintenance costs that are specific to a mobile application? And more importanty, how does the Streaks app from Crunchy Bagel manage to do without subscriptions? My point being that the recurring cost of a developer license can easily be diluted on one-time payments.
Dependency updates, security updates, bug fixes. Yes, if your userbase is in the hundreds of thousands, the one time payments will cover a developer's lifetime of maintenance work. But if you are a random HN dev with a 20-user app, then the 100 dollars, you will not cover a 10 year period of maintenance work, unless your app has zero dependencies and doesn't use any web apis. Crunchy Bagel is not a random HN dev maki…
I wouldn't answer questions or read feedback then as a dev because it's not a product really, but why not go that route?