To each their own, but I find this decision really misguided.
It's her money, not mine, so whatever, but l do not expect her to turn a profit in, rather the opposite.
In my view, the cross section of "IfR" users and people willing to subscribe monthly is rather small (especially if the money mostly goes to reddit - assuming I could afford it, I, for instance, would rather fund an open system like Lemmy).
And if Apollo's dev Christian Selig decided that it wasn't worth it with an already established paying user base, who already has a strong culture of subscriptions and exaggerated pricings, and one of the highest volume of users, at what probably was the peak usage of the platform; I don't see how a small app like IfR can survive.
That, or Christian made a pretty expensive mistake...
Infinity for Reddit is OpenSource: https://github.com/Docile-Alligator/Infinity-For-Reddit
Apparently Reddit doesn't allow the original developer to publish the app with a field for a user API key... but there are tutorials on what to modify to get it to work, and there might be forks out there with the required fields baked in.
expired
If the app developer doesn't have an API key in the app though then what power does Reddit have to stop them? Reddit would have to ban each individual API key that people generated and put in the app, no?