I’ve been at it over a decade now and still found the only reliable way to make money from offline App Store apps is good old fashioned paid apps, $2.99 being a nice sweet-spot.

If you had customers buying last year, it’s likely you’ll have even more customers buying next year. If you stop maintaining your app, that stream of new sales almost immediately dries up.

Offline mobile apps which charge a subscription are a very silly fad to me. The few that get away with it are being steadily edged out by someone else who wants to eat their lunch.

I love the OP’s idea and absolutely see the use case. I also think it’s very promptable. My unsolicited advice is to strike while the iron’s hot at $0.99, because I’d be very skeptical if they’ll attract enough subscribers before getting starved out by copycats.

This is hardly convincing. A $99/yr fee and a once every 2 years update doesn't warrant a monthly subscription fee from every user. Eg a $9.99 app could cover those costs with a few dozen downloads

OK? That's just the reality of business. You launch something and then need to do marketing to keep getting it in front of people until word spreads around that your app is a must-have thing for whatever it does and you get a decent number of sales every month.

In general, when I buy something I want to pay for it once and then have it. I don't want to rent or lease it, even if it's consumable. When I eat a restaurant I I pay for the meal when it's over; if it was delicious I might come back again. Even if I like it so much that I eat there every week, that doesn't mean I want a weekly subscription.

demonstrably incorrect, it is very easy to find apps with "last updated" dates 2+ years ago. Paid example:

https://apps.apple.com/us/app/a-dark-room/id736683061

users don't need the app to be maintained, just installed once.

What’s their LLM sub cost? That’s the ongoing cost plus App Store fee. Some expensive sub to save photos is just dumb.