Because if you're not willing to do the legwork to see if your app is following the letter of the law in those countries, you may be subjected to being banned due to violation of said laws.
That's not really an argument. Go ahead and ban it. There's no reason anyone should preemptively ban themselves just because someone else wants them banned.
It's a bit like saying "You should hang yourself, because if you don't, I'll hang you." The proper response is "get on with it then."
It's a bit like saying "You should hang yourself, because if you don't, I'll hang you." The proper response is "get on with it then."