Privacy apps stop your device using screen lock to enhance data encryption

I have tried a few third party apps to warn me when apps want to use features such as camera and/or microphone, but when I try to activate them, I get the same warning - “If you turn on app name, your device won’t use your screen lock to enhance data encryption”

Are there any of these apps that won’t cause this problem, and why does this problem happen anyway?

Thanks

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