Now my question based on your comment is, what is the need of privacy in gambling when the casino in question already know who you are?
this is in terms of those that have completed a KYC verification on the casino, is there still any need hiding your identity of location from the casino even after you've completed kyc verification?
Answering that question may be hard but we all know that different people with their reasons for doing things and only the individuals involved know exactly why they do what they do, and VPV flagging on casinos have been due to some of these reasons but is not limited to them.
1: casinos flag vpn accounts when there are suspected cases of a violation of their terms and conditions, in this sense a player trying to bypass restrictions.
2: when there is bonus abuse and the case of multiple accounts, this way Chester tries to use VPN to stay off the radar and keep accumulating casino bonuses under multiple accounting.