>PIA absolutely does not keep any logs, of any kind, period. While this does make things harder in some cases, specifically dealing with outbound mail, advanced techniques to handle abuse issues, and things of that nature, this provides a high level of security and privacy to all of our users. Logs are never written to the hard-drives of any of our machines and are specifically written to the null device, which simply acts if the data never existed.
From https://www.privateinternetaccess.com/helpdesk/kb/articles/d...
They don't say they aren't using deep packet inspection, and it acknowledges that makes it more difficult to handle abuse.