Happened to me recently with an app which is the interactive version of a book. From one day to the other they switched from buying chapters/the book to some stupid subscription.
If they can't make a living they need to charge more and if they can't charge more they need to find a real job/business.
It’s especially bizarre that you’re ranting about them needing to find a real business when that is exactly what they’re doing by finding a billing model which is viable long-term.
It's impossible to say if a particular app will in a week:
a) still be available
b) if it will have switched to subscriptions or free + IAP or free with ads and IAP
c) what the IAPs will be and if your old (if any) IAPs will still work.
d) if they'll decide to sell your info to the next available bidder
This is why almost all apps are worthless and why I've essentially stopped purchasing or downloading apps. It's simply not worth the trouble to invest time to learn to use an app and investigate whether you can trust the developer.
That’s exactly what they’re doing: charging more.
The only kind of reasonable subscription is what's used for IntelliJ & co: if you stop paying after a minimum of X months, you get to keep what you paid for.
$200 is about 10 to 20-ish decent meals in most US cities (not high class, but not bottom barrel fast food either).
Do _most_ apps really not provide as much utility over a lifetime of use as ten meals?
If the users see no value in paying for it, then there are better business opportunities to spend development efforts on.