My biggest abusers when I had my free host signup open were from China. No other country ever gave me trouble and I had plenty of great international traffic as well who did NOT abuse.
And by abuse, I mean:
- Using it for file storage
- Making illegal sites
- Hosting warez, porn, etc
- Hosted PHP Shells (Like r57shell....c99shell...etc...common shells used by people to try to break into the host)
- One of em uploaded a mail(); bomber, but I didnt approve of any of the mail.
- Lied all the time about what they were going to use the account for "(e.g. one time they said they were a student and desperately needed free hosting... I approved it, and the next minute the account is loaded with PHPshells and then never used afterward -.-)
I had enough, so, I just banned their range from the signup.
Of course, I've had American people who broke my ToS but it was much less often... and if anything serious ever happened, I would at least know that I could possibly contact their ISP about the problem.