This example originally used react-native-tesseract-ocr, but that module is out of date and seems to have been abandoned. It now uses a local Expo Module that wraps ML Kit Vision Text recognition.
The Expo Module includes native code, so you will need to build with EAS Build. This also means that it will NOT work with the Expo Go app.
Instead of the Expo Go app you can build a Custom Development Client, which is basically like a custom version of Expo Go that includes only your dependencies.
See the EAS Build documentation for more possibilities.
eas build --platform android --profile development
eas build --platform android --profile production