Yep we have very strict rules on this and secure safety measures that tracks it all. Without revealing too much on the tech side, our systems prevent the same user from playing on the same table or opening up more than one account even if they used VPN's. We track far more than just IP's. On top of which we manually check other aspects of our user base manually such as username/email syntax's, login frequencies and playing styles. We also have other security measures in place to stop chip dumping and soft playing techniques. From our connections with the engineers who work on PokerStars's infrastructure - we adopted a lot of their methods into our own systems.

We even take it a step further and assess hand histories often with new active players who joined up within 7 days. This involves time to action, playing styles, chat logs and anything else that happens within the hand.

Security will always be one of our top priorities which is why it was highlighted heavily in our introduction video: https://www.youtube.com/watch?v=4LoF1ViAY2c (From 1:46) or our security paper here: https://medium.com/@CryptoPokerClub/one-of-the-most-secured-online-poker-games-ever-security-protocols-explained-b81210f184d8