No hacking or stealing or anything like that involved. I just happen to have an US account too. I paid for and downloaded the game from there and play the game on my European account, that's all to it. As all games on PS4 are region free there's no problem. I also have the Japanese version of Dragonquest builders, aquired form the Japanese PSN store, played on the European account.
I created two account NailbachMurica and NailbachJPN just for that alone.
Why should Sony ban my account? There's nothing unrightful to this. It's also nowhere stated in the Terms of Service that you can't do that.