Pretty sure Fifth Star Labs’ Sky Guide iOS icon does this. Not the whole icon, just the stars in it. Hiding the app in a folder helps but I’m looking for a better alternative just because of this.

As a workaround, you can use a home screen shortcut to start the app.

But I agree that app developers shouldn’t do this, or should at least provide an option to turn it off. (Some apps allow customizing the app icon color, so it seems that should be possible.)

Uninstall the app? Leave a review, tell the developer.