That said, we wish the App Store offered a better solution than what we had to settle with; we'd much rather people know up-front the business model than download the app, be surprised, and possibly leave a negative review.
As far as replacing the first party camera, it's by far our top user request. Some users have come up with interesting hacks via shortcuts or the back-tap gesture, but we'd much rather the user be able to customize it similar to how iOS now lets you set a different default browser. Hopefully someday!