Why hasn't anyone created a call recording app that works on Android 15 or higher (open source, private and secure)?

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The original was posted on /r/opensource by /u/EstidEstiloso on 2026-06-14 17:36:02+00:00.

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Pixel and Samsung have this feature built-in. The trick is that when recording starts, a voice message plays in the background informing the user that the call is being recorded, allowing for legal call recording (European Union). This is better than nothing.

Is it really that difficult to create something similar that’s both open source and private? Why are these kinds of apps practically nonexistent on F-Droid, or why don’t the existing ones work? I’m just asking out of curiosity.

I know there are some apps that work on the Play Store, but they aren’t open source and have a lot of tracking features.