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Google already allows online banking apps to block screenshot functionality, which is in my opinion total bullshit. The owner/user of a device should always be able to take a screenshot if they want. At least every bank has a market based need to allow regular browsers to sign in to online banking, to support desktop clients, so one can just ignore the provided bank's app if you want.

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It's to prevent malicious applications taking a screenshot of sensitive information. I've seen other apps doing this on, for example, credit card info entry screens.

Then limit to sensitive information, not every screen.

Then prevent malicious apps from doing that without preventing the user.

All apps can do this as far as I know. Firefox for Android has an option to disable screenshots in private tabs.

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