It is, but the US and the EU legally recognize each other's copyrights. So he can sue the Chinese company in his country, and when they don't show up send Apple a notice to freeze assets related to the company, which just needs a US lawyer. In the end the lawyers win, but it is a straight forward case (assuming all the facts are as given...)

Yes, you likely could threaten Apple with a lawyer. But based on your comment you likely have never dealt with a lawsuit, especially involving several jurisdictions. And trust me, the lawyer want the same thing as the scammer. Your money!

"I have never been ruined but twice in my life — once when I lost a lawsuit, and once when I won one."—Voltaire

And how long does that legal process take compared to the time it takes for the spammer to set up a new legal entity, app, and App Store account?

Can't he get it out of the App Store in his jurisdiction (EU + US with reciprocal agreements).

I guess the Chinese copycat will still be sold in China and other non-compliant markets for IP law but that would ba a partial victory.

Maybe it is better to sue Apple instead, for allowing such apps - they claim they have "strict guidelines" and review all apps before accepting them .... If many developers around the world start doing this, it becomes a PR issue and costs them money too in legal fees ... may even force them to fix the issue.

The Northrups did a video on this for a photo that was clearly stolen from them:

https://youtu.be/DUEbi4r8Pg0