The MOD APK is definitely not an official app. And most of the time, MOD APK unlocks premium features, available in the official app are in-app purchases. This is one-way app developers make money. This is clearly not in the interest of the original creator of the app, and there are strict copyright laws against it. However, most of the laws are for distributors, not users. Therefore, this is not the case with the circulation of every MOD APK. It’s not a serious crime if it’s a MOD APK of a free app, just added fan love feature and not officially available.