There are a few ways around detection, as long as you're smart about it, they're likely to never find out.
One method is:
-Use a cloaked/redirect url to point to a script (or scripts) on your domain which scrubs the referer and then sends the traffic to the CPA offer. After a day or two, send that traffic somewhere else, even a blank page. Then upload some new torrents with different offers at a different company, and repeat the process. Greed is what gets you caught
I've been doing this en mass, uploading possibly 1000+ torrents every couple of days using a script I wrote. It does extremely well...