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Snapchat is a terrible example; they don't actually use the camera to take pictures, they just take a screenshot of the camera on-screen view.

Not surprisingly so if you've worked with Android's Camera(2) APIs

...and that's how people use their phone cameras. Very low-quality; very temporary.

Not everyone.

Snapchat has 170M daily users as of 2019.

And how many daily users do you think the Camera app has?

189 Million

That’s the estimated US iPhone install base. Apple said it was above 900M globally in January.