If you are using a VPN to commit illegal acts and evade the authorities you shod reconsider using a VPN. There is technology out there that makes you anonymous for free and relies on no central party to protect your identity.
Are you talking about TOR? There's no 100% safe protection, you are anonymous as long as there's not enough resources dedicated to finding you. With a bounty large enough you can track down anyone.
Well, if we are approaching it with that perspective, one should really just stay away from the internet in general. You'll always leave some sort of footprint.