Everybody can be tracked. How do you think the police works?
But of course not by this board. Employees working for the ISP's working for the good site at those ISP's a specific board uses can do the job. All of the larger routers can be configured to log a specific client.
In order to make something out of the log file, it demands that you create a user-account or just use a guest-account. Then you post one single post. You know your own IP-address and you can read the timestamp from the log for the traffic between the board's IP-address and your computer. Once you learn the pattern a post create on a board, you can trace IP-numbers of various posters. The pattern is rather important because viewers create traffic also, but they do it in another way.
The BM-industry could of course pay an employee at Fornits ISP for doing the same job and thats why all volunteers post through the same terminal server in Denmark. You can only trace one, maybe two IP-numbers from our posters. Another trick is to access the board through one of the Ano-surf websites, but can you be sure that they don't keep your passwords etc for marketing purposes?