This is why on principle I almost 99.99% refuse to invest time or money in any app or service that is an ongoing cost that can be taken away or enshittified.

It needs to not collect data, have a single purchase (or yearly feature update subscriptions that don’t affect the underlying functionality that is permanently available to me as a user) and if there’s any doubt about that I’m looking for the next, more permanent solution + negative review for enshittifiers

If it is not open source, and you are not paying, someone else is and you are the product.

There was an iOS app I used like this that did a great job of scanning text books.

After I used it for about 6 months this exact thing happened. Started charging fees for many different things.

Exporting images as pdf had a charge, then scanning to make the text searchable had a fee.

I just exported as jpg and used imagic and ocrmypdf to take care of this.

Then I learned that iOS has a built in scanner in the files app, so I just switched to that one.