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This is a most excellent place for technology news and articles.
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.